/*
Theme Name: DSina
Theme URI: https://dsina.cn
Author: DSina Team
Author URI: https://dsina.cn
Description: DSina 智能教育平台主题 - 融合粒子动画、渐变效果、3D效果，适用于教育、科技类网站。
Version: 2.0.2
Requires at least: 6.0
Tested up to: 6.5
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: dsina
Tags: 响应式, 科技风, 霓虹风格, 粒子动画, 自定义菜单, 小工具
*/

/* ===== CSS Variables ===== */
:root {
    --bg-deep: #ffffff;
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --neon-blue: #0066cc;
    --neon-purple: #7c3aed;
    --neon-cyan: #0891b2;
    --neon-pink: #db2777;
    --neon-gold: #d97706;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-dim: #64748b;
    --glow-blue: rgba(0, 102, 204, 0.15);
    --glow-purple: rgba(124, 58, 237, 0.15);
    --card-bg: rgba(255, 255, 255, 0.95);
    --card-border: #d1d5db;
    --container-width: 1200px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

a {
    color: var(--neon-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--neon-purple);
}

/* 渐变背景按钮悬停时保持白色文字 */
.btn-primary:hover,
.nav-highlight:hover {
    color: #ffffff !important;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ===== Loading Screen ===== */
#loading-screen {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--bg-deep);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}
#loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}
#loading-screen .loader-ring {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 2px solid transparent;
    border-top-color: var(--neon-blue);
    border-right-color: var(--neon-purple);
    animation: spin 1s linear infinite;
    position: relative;
}
#loading-screen .loader-ring::before {
    content: '';
    position: absolute;
    inset: 8px;
    border-radius: 50%;
    border: 2px solid transparent;
    border-bottom-color: var(--neon-cyan);
    border-left-color: var(--neon-pink);
    animation: spin 0.6s linear infinite reverse;
}
#loading-screen .loader-text {
    margin-top: 28px;
    font-size: 13px;
    letter-spacing: 8px;
    text-transform: uppercase;
    color: var(--text-secondary);
    animation: pulseText 1.5s ease-in-out infinite;
}
#loading-screen .loader-logo {
    margin-bottom: 32px;
    opacity: 0;
    animation: logoReveal 2s ease forwards 0.3s;
}
#loading-screen .loader-logo img {
    height: 48px;
    filter: drop-shadow(0 0 20px rgba(0,212,255,0.5));
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulseText { 0%,100% { opacity: 0.3; } 50% { opacity: 1; } }
@keyframes logoReveal { to { opacity: 1; transform: scale(1); } }

/* ===== Canvases ===== */
#particles-canvas, #bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}
#bg-canvas { opacity: 0.4; }

/* ===== Grid Overlay ===== */
.grid-overlay {
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(0,212,255,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,212,255,0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: 0;
    pointer-events: none;
    mask-image: radial-gradient(ellipse at center, black 40%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 40%, transparent 70%);
}

/* ===== Glow Orbs ===== */
.glow-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    pointer-events: none;
    z-index: 0;
}
.glow-orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,212,255,0.12), transparent 70%);
    top: -200px;
    left: -200px;
    animation: orbFloat 20s ease-in-out infinite;
}
.glow-orb-2 {
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(168,85,247,0.1), transparent 70%);
    bottom: -200px;
    right: -200px;
    animation: orbFloat 25s ease-in-out infinite reverse;
}
.glow-orb-3 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(34,211,238,0.08), transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    animation: orbFloat 18s ease-in-out infinite 2s;
}
@keyframes orbFloat {
    0%,100% { transform: translate(0,0); }
    33% { transform: translate(60px,-40px); }
    66% { transform: translate(-30px,60px); }
}

/* ===== Code Rain ===== */
.code-rain {
    position: fixed;
    top: 0;
    right: 0;
    width: 300px;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.06;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--neon-blue);
    writing-mode: vertical-rl;
    overflow: hidden;
    display: flex;
    gap: 20px;
}
.code-rain span {
    animation: rainDown 10s linear infinite;
    opacity: 0;
}
.code-rain span:nth-child(2n) { animation-delay: 2.5s; color: var(--neon-purple); }
.code-rain span:nth-child(3n) { animation-delay: 5s; color: var(--neon-cyan); }
.code-rain span:nth-child(5n) { animation-delay: 7.5s; }
@keyframes rainDown {
    0% { transform: translateY(-100vh); opacity: 0.8; }
    80% { opacity: 0.5; }
    100% { transform: translateY(100vh); opacity: 0; }
}

/* ===== Container ===== */
.container {
    position: relative;
    z-index: 1;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 18px 0;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(24px) saturate(1.4);
    -webkit-backdrop-filter: blur(24px) saturate(1.4);
    border-bottom: 1px solid rgba(0,102,204,0.1);
    transition: all 0.4s ease;
}
.navbar.scrolled {
    background: rgba(255,255,255,0.98);
    border-bottom-color: rgba(0,102,204,0.2);
    box-shadow: 0 4px 40px rgba(0,0,0,0.1);
}
.navbar .container {
    display: flex;
    align-items: center;
}
.navbar .logo {
    margin-right: 68px;
}
.nav-links {
    margin-right: auto;
    gap: 32px;
}
.nav-auth-btn {
    margin-left: auto !important;
    display: flex;
    align-items: center;
    flex-shrink: 0;
}
.navbar .logo {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
    position: relative;
}
.navbar .logo img {
    height: 42px;
    width: auto;
    filter: drop-shadow(0 0 12px rgba(0,212,255,0.3));
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 18px;
    font-weight: 500;
    letter-spacing: 1px;
    transition: color 0.3s ease;
    position: relative;
    padding: 4px 0;
}
.nav-links a::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), transparent);
    transition: width 0.4s ease;
}
.nav-links a:hover {
    color: var(--text-primary);
    text-shadow: 0 0 20px rgba(0,212,255,0.3);
}
.nav-links a:hover::before { width: 100%; }

/* 导航链接激活状态 */
.nav-links a.active {
    color: var(--neon-blue) !important;
    font-weight: 600;
}
.nav-links a.active::before {
    width: 100%;
}
.nav-links a.active:hover {
    text-shadow: 0 0 20px rgba(0,212,255,0.5);
}

/* 正在学习按钮 - 蓝底白字 */
.nav-highlight {
    display: inline-block !important;
    padding: 10px 24px !important;
    border-radius: 10px !important;
    background: linear-gradient(135deg, #0066cc, #0088ff) !important;
    color: #fff !important;
    font-weight: 600 !important;
    font-size: 16px !important;
    letter-spacing: 1px !important;
    border: none !important;
    box-shadow: 0 4px 16px rgba(0,102,204,0.3) !important;
    transition: all 0.3s ease !important;
    line-height: 1.2 !important;
    text-decoration: none !important;
}
.nav-highlight:hover {
    background: linear-gradient(135deg, #0055bb, #0077ee) !important;
    box-shadow: 0 6px 20px rgba(0,102,204,0.4) !important;
    transform: translateY(-1px) !important;
    text-shadow: none !important;
}
.nav-highlight.active,
.nav-links .nav-highlight.active {
    background: linear-gradient(135deg, #0066cc, #0088ff) !important;
    color: #fff !important;
    box-shadow: 0 4px 16px rgba(0,102,204,0.3) !important;
}
.nav-highlight.active:hover,
.nav-links .nav-highlight.active:hover {
    background: linear-gradient(135deg, #0055bb, #0077ee) !important;
    color: #fff !important;
    box-shadow: 0 6px 20px rgba(0,102,204,0.4) !important;
    transform: translateY(-1px) !important;
}
.nav-auth-btn {
    display: inline-block !important;
    padding: 10px 24px !important;
    border-radius: 10px !important;
    border: 1px solid rgba(0,102,204,0.2) !important;
    background-color: rgba(0,102,204,0.05) !important;
    color: var(--neon-blue) !important;
    font-weight: 600 !important;
    font-size: 14px !important;
    letter-spacing: 0.5px !important;
    text-decoration: none !important;
    transition: all 0.3s ease !important;
    line-height: 1.2 !important;
    cursor: pointer !important;
    position: relative;
    box-shadow: 0 2px 8px rgba(0,102,204,0.1);
}
.nav-auth-btn::before {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), transparent);
    transition: width 0.4s ease;
}
.nav-auth-btn:hover {
    background-color: rgba(0,102,204,0.12) !important;
    border-color: rgba(0,102,204,0.4) !important;
    color: var(--neon-blue) !important;
    text-shadow: 0 0 20px rgba(0,212,255,0.3);
    box-shadow: 0 4px 16px rgba(0,102,204,0.2);
    transform: translateY(-1px);
}
.nav-auth-btn:hover::before {
    width: 100%;
}

/* 已登录用户名的样式 */
.nav-auth-btn.user-name-btn {
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple)) !important;
    color: #fff !important;
    border-color: transparent !important;
    box-shadow: 0 4px 20px rgba(0,102,204,0.3);
}
.nav-auth-btn.user-name-btn:hover {
    background: linear-gradient(135deg, var(--neon-purple), var(--neon-blue)) !important;
    box-shadow: 0 6px 24px rgba(124,58,237,0.4);
    transform: translateY(-2px);
}

.nav-register-btn {
    padding: 12px 20px;
    border-radius: 10px;
    border: 1px solid rgba(168,85,247,0.3);
    background: rgba(168,85,247,0.08);
    color: var(--neon-purple) !important;
    font-weight: 600 !important;
    font-size: 15px !important;
    letter-spacing: 0.5px !important;
    transition: all 0.3s ease !important;
    backdrop-filter: blur(8px);
}
.nav-register-btn:hover {
    background: rgba(168,85,247,0.15) !important;
    border-color: rgba(168,85,247,0.5) !important;
    box-shadow: 0 0 20px rgba(168,85,247,0.15) !important;
    transform: translateY(-1px) !important;
}
.nav-register-btn::before { display: none !important; }

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}
.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 140px 24px 80px;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 200px;
    background: linear-gradient(to top, var(--bg-deep), transparent);
    z-index: 1;
    pointer-events: none;
}
.hero-content {
    max-width: 960px;
    position: relative;
    z-index: 2;
}
.hero .badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 24px;
    border: 1px solid rgba(0,212,255,0.2);
    border-radius: 100px;
    font-size: 12px;
    color: var(--neon-blue);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 32px;
    background: rgba(0,212,255,0.04);
    backdrop-filter: blur(10px);
    animation: fadeInUp 1s ease forwards;
}
.hero .badge .pulse-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--neon-blue);
    animation: pulseDot 2s ease-in-out infinite;
}
@keyframes pulseDot {
    0%,100% { box-shadow: 0 0 0 0 rgba(0,212,255,0.5); }
    50% { box-shadow: 0 0 0 8px rgba(0,212,255,0); }
}
.hero h1 {
    font-size: clamp(44px,9vw,100px);
    font-weight: 800;
    line-height: 1.05;
    margin-bottom: 20px;
    position: relative;
}
.hero h1 .gradient-text {
    background: linear-gradient(135deg, var(--neon-blue) 0%, var(--neon-purple) 40%, var(--neon-pink) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% 200%;
    animation: gradientShift 4s ease-in-out infinite;
}
@keyframes gradientShift {
    0%,100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}
.hero .hero-headline-glow {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0,212,255,0.08), transparent);
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    filter: blur(60px);
    pointer-events: none;
    animation: glowPulse 4s ease-in-out infinite;
}
@keyframes glowPulse {
    0%,100% { transform: translate(-50%,-50%) scale(1); opacity: 0.6; }
    50% { transform: translate(-50%,-50%) scale(1.2); opacity: 1; }
}
.hero .subtitle {
    font-size: clamp(17px,2.2vw,26px);
    color: var(--text-secondary);
    font-weight: 300;
    max-width: 660px;
    margin: 0 auto 44px;
    letter-spacing: 0.5px;
    line-height: 1.8;
}
.hero .cta-group {
    display: flex;
    gap: 18px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}
.hero .btn {
    padding: 16px 40px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.4s ease;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
}
.btn-primary {
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    color: #fff;
    box-shadow: 0 4px 30px rgba(0,212,255,0.3);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 50px rgba(0,212,255,0.45);
}
.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}
.btn-primary:hover::before { transform: translateX(100%); }
.btn-outline {
    background: transparent;
    color: var(--neon-blue);
    border: 1px solid rgba(0,212,255,0.3);
    backdrop-filter: blur(10px);
}
.btn-outline:hover {
    background: rgba(0,212,255,0.08);
    border-color: var(--neon-blue);
    box-shadow: 0 0 30px rgba(0,212,255,0.2);
    transform: translateY(-3px);
}

/* Hero Stats */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
}
.hero-stat-item {
    text-align: center;
    position: relative;
}
.hero-stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -30px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, transparent, rgba(0,212,255,0.2), transparent);
}
.hero-stat-number {
    font-size: 38px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
}
.hero-stat-label {
    font-size: 13px;
    color: var(--text-dim);
    letter-spacing: 1px;
    margin-top: 4px;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    animation: bounceDown 2s ease-in-out infinite;
}
.scroll-indicator span {
    font-size: 10px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-dim);
}
.scroll-indicator .mouse {
    width: 24px;
    height: 38px;
    border: 2px solid rgba(0,212,255,0.2);
    border-radius: 12px;
    position: relative;
}
.scroll-indicator .mouse::after {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 8px;
    background: var(--neon-blue);
    border-radius: 2px;
    animation: scrollWheel 1.5s ease-in-out infinite;
}
@keyframes bounceDown {
    0%,100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}
@keyframes scrollWheel {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(16px); }
}

/* ===== Section Header ===== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
}
.section-header .section-tag {
    display: inline-block;
    padding: 6px 18px;
    border: 1px solid rgba(0,212,255,0.15);
    border-radius: 100px;
    font-size: 11px;
    color: var(--neon-blue);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 16px;
    background: rgba(0,212,255,0.03);
}
.section-header h2 {
    font-size: clamp(30px,4vw,48px);
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}
.section-header h2 .gradient-text {
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-header p {
    color: var(--text-secondary);
    font-size: 17px;
    max-width: 560px;
    margin: 0 auto;
    line-height: 1.7;
}
.section-header .accent-line {
    width: 60px;
    height: 2px;
    margin: 20px auto 0;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), transparent);
    border-radius: 2px;
}

/* ===== Core Features ===== */
.core-section {
    padding: 120px 24px;
    position: relative;
}
.core-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    max-width: 1100px;
    margin: 0 auto;
}
.core-card {
    perspective: 1200px;
}
.core-card-inner {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 52px 44px;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(16px);
    border: 2px solid var(--card-border);
    transition: all 0.6s cubic-bezier(0.23,1,0.32,1);
    transform-style: preserve-3d;
    cursor: default;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.core-card-inner:hover {
    transform: rotateX(-3deg) rotateY(3deg) translateZ(10px);
    border-color: var(--neon-blue);
    box-shadow: 0 20px 80px rgba(0,0,0,0.12), 0 0 40px rgba(0,212,255,0.12);
}
.core-card-inner::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 24px;
    padding: 1px;
    background: linear-gradient(135deg, var(--card-border-color, var(--neon-blue)), transparent 60%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}
.core-card.math .core-card-inner { --card-border-color: var(--neon-blue); }
.core-card.lang .core-card-inner { --card-border-color: var(--neon-purple); }
.core-card-inner::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at var(--mouse-x,50%) var(--mouse-y,50%), var(--card-glow,rgba(0,212,255,0.06)), transparent 60%);
    pointer-events: none;
    transition: opacity 0.4s ease;
}
.core-card-inner:hover::after { opacity: 1; }
.core-card .icon-area {
    font-size: 60px;
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}
.core-card .icon-area .sym {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,255,255,0.03);
    border-radius: 14px;
    padding: 10px 16px;
    font-size: 30px;
    font-weight: 300;
    transition: all 0.3s ease;
    min-width: 44px;
    border: 1px solid rgba(255,255,255,0.05);
}
.core-card.math .icon-area .sym {
    color: var(--neon-blue);
    border-color: rgba(0,212,255,0.12);
}
.core-card.math .icon-area .sym:hover {
    background: rgba(0,212,255,0.08);
    box-shadow: 0 0 24px rgba(0,212,255,0.2);
    transform: translateY(-3px);
}
.core-card.lang .icon-area .sym {
    color: var(--neon-purple);
    border-color: rgba(168,85,247,0.12);
}
.core-card.lang .icon-area .sym:hover {
    background: rgba(168,85,247,0.08);
    box-shadow: 0 0 24px rgba(168,85,247,0.2);
    transform: translateY(-3px);
}
.core-card h3 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
    z-index: 1;
}
.core-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}
.core-card .feature-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}
.core-card .feature-tags span {
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 12px;
    border: 1px solid rgba(255,255,255,0.06);
    background: rgba(255,255,255,0.03);
    color: var(--text-secondary);
}
.core-card.math .feature-tags span {
    border-color: rgba(0,212,255,0.1);
    color: var(--neon-blue);
}
.core-card.lang .feature-tags span {
    border-color: rgba(168,85,247,0.1);
    color: var(--neon-purple);
}
.core-card .card-shine {
    position: absolute;
    top: 0;
    left: -100%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.03), transparent);
    transform: skewX(-25deg);
    transition: left 0.8s ease;
    pointer-events: none;
}
.core-card-inner:hover .card-shine { left: 150%; }

/* ===== Dashboard ===== */
.dashboard-section {
    padding: 120px 24px;
    position: relative;
}
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    max-width: 1100px;
    margin: 0 auto;
}
.dashboard-main {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 40px;
    border: 2px solid #d1d5db;
    backdrop-filter: blur(16px);
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.dashboard-main::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), var(--neon-cyan));
}
.dashboard-main h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.dashboard-main h3 .live-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22c55e;
    animation: pulseDot 2s ease-in-out infinite;
}
.stat-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 28px;
}
.stat-card {
    background: #ffffff;
    border-radius: 16px;
    padding: 24px;
    border: 1.5px solid #e5e7eb;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.stat-card:hover {
    background: #ffffff;
    border-color: var(--neon-blue);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,212,255,0.15);
}
.stat-card .stat-value {
    font-size: 36px;
    font-weight: 800;
    display: block;
    margin-bottom: 4px;
}
.stat-card .stat-value.blue { color: var(--neon-blue); }
.stat-card .stat-value.purple { color: var(--neon-purple); }
.stat-card .stat-value.cyan { color: var(--neon-cyan); }
.stat-card .stat-value.pink { color: var(--neon-pink); }
.stat-card .stat-label {
    font-size: 13px;
    color: var(--text-dim);
    letter-spacing: 0.5px;
}
.stat-card .stat-bar {
    width: 100%;
    height: 4px;
    background: rgba(255,255,255,0.06);
    border-radius: 2px;
    margin-top: 12px;
    overflow: hidden;
}
.stat-card .stat-bar-fill {
    height: 100%;
    border-radius: 2px;
    width: 0%;
    transition: width 2s ease;
}
.stat-card .stat-bar-fill.blue { background: linear-gradient(90deg, var(--neon-blue), var(--neon-cyan)); }
.stat-card .stat-bar-fill.purple { background: linear-gradient(90deg, var(--neon-purple), var(--neon-pink)); }
.stat-card .stat-bar-fill.cyan { background: linear-gradient(90deg, var(--neon-cyan), var(--neon-blue)); }
.stat-card .stat-bar-fill.pink { background: linear-gradient(90deg, var(--neon-pink), var(--neon-purple)); }

.dashboard-chart {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 40px;
    border: 2px solid #d1d5db;
    backdrop-filter: blur(16px);
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.dashboard-chart::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-purple), var(--neon-blue), var(--neon-pink));
}
.dashboard-chart h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.chart-bars {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    height: 200px;
    padding-top: 20px;
}
.chart-bar-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}
.chart-bar {
    width: 100%;
    border-radius: 6px 6px 2px 2px;
    min-height: 8px;
    position: relative;
    transition: height 2s cubic-bezier(0.23,1,0.32,1);
}
.chart-bar .bar-tooltip {
    position: absolute;
    top: -32px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.chart-bar-wrapper:hover .bar-tooltip { opacity: 1; }
.chart-label {
    font-size: 11px;
    color: var(--text-dim);
    white-space: nowrap;
}
.chart-legend {
    display: flex;
    gap: 20px;
    margin-top: 20px;
    flex-wrap: wrap;
}
.chart-legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}
.chart-legend-dot {
    width: 8px;
    height: 8px;
    border-radius: 2px;
}

/* ===== About ===== */
.about-section {
    padding: 120px 24px;
    position: relative;
    overflow: hidden;
}
.about-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(0,212,255,0.03), transparent 60%);
    pointer-events: none;
}
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    max-width: 1100px;
    margin: 0 auto;
    align-items: center;
}
.about-text h2 {
    font-size: clamp(30px,4vw,42px);
    font-weight: 700;
    margin-bottom: 24px;
}
.about-text p {
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 20px;
    font-size: 16px;
}
.about-text .about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 32px;
}
.about-text .about-stat-item {
    padding: 20px;
    background: #ffffff;
    border-radius: 16px;
    border: 1.5px solid #e5e7eb;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.about-text .about-stat-item .num {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
}
.about-text .about-stat-item .label {
    font-size: 12px;
    color: var(--text-dim);
    margin-top: 4px;
}
.about-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}
.about-geo-grid {
    width: 100%;
    height: 400px;
    position: relative;
    background: radial-gradient(circle at center, rgba(0,212,255,0.04) 0%, transparent 70%);
    border-radius: 24px;
    border: 1px solid rgba(0,212,255,0.06);
    overflow: hidden;
}
.about-geo-grid canvas {
    width: 100%;
    height: 100%;
}

/* ===== Testimonials ===== */
.testimonials-section {
    padding: 120px 24px;
    position: relative;
}
.testimonials-slider {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}
.testimonials-track {
    display: flex;
    transition: transform 0.6s cubic-bezier(0.23,1,0.32,1);
}
.testimonial-card {
    min-width: 100%;
    padding: 0 20px;
}
.testimonial-inner {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 48px;
    border: 2px solid #d1d5db;
    backdrop-filter: blur(16px);
    position: relative;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.testimonial-inner::before {
    content: '"';
    position: absolute;
    top: 20px;
    left: 30px;
    font-size: 80px;
    line-height: 1;
    color: rgba(0,212,255,0.06);
    font-family: Georgia, serif;
}
.testimonial-inner .quote {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 28px;
    font-style: italic;
    position: relative;
    z-index: 1;
}
.testimonial-inner .author {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}
.testimonial-inner .author-avatar {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
}
.testimonial-inner .author-info .name {
    font-weight: 600;
    font-size: 15px;
}
.testimonial-inner .author-info .role {
    font-size: 13px;
    color: var(--text-dim);
}
.testimonial-inner .rating {
    margin-bottom: 16px;
    color: var(--neon-gold);
    font-size: 18px;
    letter-spacing: 4px;
}
.slider-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-top: 32px;
}
.slider-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 1px solid rgba(0,212,255,0.15);
    background: rgba(0,212,255,0.04);
    color: var(--neon-blue);
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.slider-btn:hover {
    background: rgba(0,212,255,0.1);
    border-color: var(--neon-blue);
    transform: scale(1.05);
}
.slider-dots {
    display: flex;
    gap: 10px;
}
.slider-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.1);
    cursor: pointer;
    transition: all 0.3s ease;
}
.slider-dot.active {
    background: var(--neon-blue);
    box-shadow: 0 0 12px rgba(0,212,255,0.4);
    width: 28px;
    border-radius: 4px;
}

/* ===== Matching ===== */
.match-section {
    padding: 120px 24px;
    position: relative;
}
.match-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 24px;
    padding: 48px;
    border: 2px solid #d1d5db;
    backdrop-filter: blur(16px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.match-row {
    margin-bottom: 28px;
}
.match-row label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}
.match-slider {
    width: 100%;
    -webkit-appearance: none;
    height: 6px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
    border-radius: 3px;
    outline: none;
    position: relative;
}
.match-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-deep);
    border: 2px solid var(--neon-blue);
    cursor: pointer;
    box-shadow: 0 0 16px rgba(0,212,255,0.3);
    transition: all 0.2s ease;
}
.match-slider::-webkit-slider-thumb:hover {
    box-shadow: 0 0 30px rgba(0,212,255,0.5);
    transform: scale(1.1);
}
.match-slider::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-deep);
    border: 2px solid var(--neon-blue);
    cursor: pointer;
}
.match-slider-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-dim);
}
.match-result {
    background: rgba(0,212,255,0.04);
    border-radius: 16px;
    padding: 28px;
    border: 1px solid rgba(0,212,255,0.08);
    margin-top: 20px;
    transition: all 0.4s ease;
}
.match-result h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.match-result .rec-course {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    background: #ffffff;
    border-radius: 12px;
    margin-bottom: 8px;
    border: 1.5px solid #e5e7eb;
    transition: all 0.3s ease;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.match-result .rec-course:hover {
    background: #ffffff;
    border-color: var(--neon-blue);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(0,212,255,0.15);
}
.match-result .rec-course .tag {
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 11px;
    background: rgba(0,212,255,0.08);
    color: var(--neon-blue);
    border: 1px solid rgba(0,212,255,0.1);
}
.match-result .rec-course .name {
    flex: 1;
    font-size: 14px;
    font-weight: 500;
}
.match-result .rec-course .match-pct {
    font-size: 13px;
    color: var(--neon-cyan);
    font-weight: 700;
}
.match-placeholder {
    text-align: center;
    padding: 40px;
    color: var(--text-dim);
}
.match-placeholder .icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.3;
}

/* ===== Consultation ===== */
.consult-section {
    padding: 120px 24px;
    position: relative;
}
.consult-form {
    max-width: 640px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: 24px;
    padding: 52px;
    border: 2px solid #d1d5db;
    backdrop-filter: blur(16px);
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
.consult-form::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), var(--neon-pink), var(--neon-cyan));
    background-size: 300% 100%;
    animation: flowLine 4s linear infinite;
}
@keyframes flowLine {
    0% { background-position: 0% 0%; }
    100% { background-position: 300% 0%; }
}
.consult-form .form-group {
    margin-bottom: 24px;
}
.consult-form label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}
.consult-form input,
.consult-form select,
.consult-form textarea {
    width: 100%;
    padding: 14px 18px;
    background: #ffffff;
    border: 1.5px solid #e5e7eb;
    border-radius: 12px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 15px;
    transition: all 0.3s ease;
    outline: none;
}
.consult-form input:focus,
.consult-form select:focus,
.consult-form textarea:focus {
    border-color: var(--neon-blue);
    box-shadow: 0 0 0 3px rgba(0,212,255,0.1);
    background: #ffffff;
}
.consult-form input::placeholder,
.consult-form textarea::placeholder {
    color: var(--text-dim);
}
.consult-form select option {
    background: var(--bg-deep);
    color: var(--text-primary);
}
.consult-form textarea {
    min-height: 100px;
    resize: vertical;
}
.consult-form .submit-btn {
    width: 100%;
    padding: 16px;
    border-radius: 12px;
    border: none;
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 30px rgba(0,212,255,0.25);
    position: relative;
    overflow: hidden;
}
.consult-form .submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 50px rgba(0,212,255,0.35);
}
.consult-form .submit-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255,255,255,0.08), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}
.consult-form .submit-btn:hover::before { transform: translateX(100%); }
.consult-form .form-success {
    display: none;
    text-align: center;
    padding: 30px;
}
.consult-form .form-success.show { display: block; }
.consult-form .form-success .check-icon {
    font-size: 48px;
    margin-bottom: 16px;
    display: block;
}
.consult-form .form-success p {
    color: var(--neon-cyan);
    font-size: 18px;
}

/* ===== Footer ===== */
.footer {
    padding: 80px 24px 40px;
    position: relative;
    border-top: 1px solid rgba(0,102,204,0.1);
    background: rgba(248,250,252,0.9);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    max-width: 1200px;
    margin: 0 auto;
}
.footer-brand p {
    color: var(--text-dim);
    font-size: 14px;
    margin-top: 16px;
    max-width: 300px;
    line-height: 1.7;
}
.footer-brand img {
    height: 36px;
    filter: drop-shadow(0 0 10px rgba(0,212,255,0.2));
}
.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}
.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dim);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 16px;
}
.footer-social a:hover {
    border-color: var(--neon-blue);
    color: var(--neon-blue);
    box-shadow: 0 0 20px rgba(0,212,255,0.15);
    transform: translateY(-2px);
}
.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--text-primary);
}
.footer-col ul {
    list-style: none;
}
.footer-col ul li {
    margin-bottom: 12px;
}
.footer-col ul a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s ease;
}
.footer-col ul a:hover { color: var(--neon-blue); }
.footer-bottom {
    max-width: 1200px;
    margin: 48px auto 0;
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.04);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}
.footer-bottom p {
    font-size: 13px;
    color: var(--text-dim);
}
.footer-bottom a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.3s ease;
}
.footer-bottom a:hover { color: var(--neon-blue); }

/* ===== Animations ===== */
.fade-in-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.23,1,0.32,1);
}
.fade-in-up.visible { opacity: 1; transform: translateY(0); }
.fade-in-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.23,1,0.32,1);
}
.fade-in-left.visible { opacity: 1; transform: translateX(0); }
.fade-in-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.23,1,0.32,1);
}
.fade-in-right.visible { opacity: 1; transform: translateX(0); }
.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.23,1,0.32,1);
}
.scale-in.visible { opacity: 1; transform: scale(1); }
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== WordPress Admin Bar ===== */
.wp-admin { z-index: 9999; }
body.admin-bar .navbar { top: 32px; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .core-grid { grid-template-columns: 1fr; gap: 32px; }
    .dashboard-grid { grid-template-columns: 1fr; }
    .about-content { grid-template-columns: 1fr; gap: 40px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .hero-stat-item:not(:last-child)::after { display: none; }
}
@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-links.mobile-open {
        display: flex;
        position: fixed;
        top: 76px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(24px);
        padding: 32px 24px;
        gap: 24px;
        border-bottom: 1px solid rgba(0,212,255,0.15);
        box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    }
    .hamburger { display: flex; }
    .hero-stats { gap: 32px; }
    .stat-cards { grid-template-columns: 1fr; }
    .about-text .about-stats { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .testimonial-inner { padding: 32px 24px; }
    .consult-form { padding: 32px 24px; }
    .match-container { padding: 32px 24px; }
    .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== Auth Modals ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all 0.4s ease;
}
.modal-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}
.modal-container {
    background: rgba(255,255,255,0.98);
    border-radius: 24px;
    padding: 36px;
    max-width: 480px;
    max-height: 85vh;
    width: 90%;
    border: 2px solid #d1d5db;
    backdrop-filter: blur(24px);
    position: relative;
    transform: translateY(30px) scale(0.95);
    transition: all 0.4s cubic-bezier(0.23,1,0.32,1);
    box-shadow: 0 20px 80px rgba(0,0,0,0.15), 0 0 60px rgba(0,102,204,0.08);
    overflow-y: auto;
}
.modal-container::-webkit-scrollbar {
    width: 4px;
}
.modal-container::-webkit-scrollbar-track {
    background: transparent;
}
.modal-container::-webkit-scrollbar-thumb {
    background: rgba(0,212,255,0.2);
    border-radius: 2px;
}
.modal-overlay.active .modal-container {
    transform: translateY(0) scale(1);
}
.modal-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), var(--neon-cyan));
    border-radius: 24px 24px 0 0;
}
.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.08);
    background: rgba(255,255,255,0.03);
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}
.modal-close:hover {
    background: rgba(0,212,255,0.1);
    border-color: var(--neon-blue);
    color: var(--neon-blue);
    transform: rotate(90deg);
}
.modal-header {
    text-align: center;
    margin-bottom: 24px;
}
.modal-header h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 6px;
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.modal-header p {
    color: #6b7280;
    font-size: 13px;
}
.auth-form .form-group {
    margin-bottom: 16px;
}
.auth-form label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 6px;
    color: #374151;
    letter-spacing: 0.3px;
}
.auth-form input,
.auth-form select {
    width: 100%;
    padding: 11px 14px;
    background: #ffffff;
    border: 1.5px solid #e5e7eb;
    border-radius: 10px;
    color: #1f2937;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    transition: all 0.3s ease;
    outline: none;
}
.auth-form input:focus,
.auth-form select:focus {
    border-color: #00d4ff;
    box-shadow: 0 0 0 3px rgba(0,212,255,0.1);
    background: #ffffff;
}
.auth-form input::placeholder {
    color: #9ca3af;
}
.auth-form select option {
    background: #ffffff;
    color: #1f2937;
}
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
}
.checkbox-label input {
    width: auto;
    accent-color: var(--neon-blue);
}
.forgot-link {
    font-size: 13px;
    color: var(--neon-blue);
    text-decoration: none;
    transition: color 0.3s ease;
}
.forgot-link:hover {
    color: var(--neon-purple);
    text-shadow: 0 0 12px rgba(0,212,255,0.3);
}
.auth-form .submit-btn {
    width: 100%;
    padding: 13px;
    border-radius: 10px;
    border: none;
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 30px rgba(0,212,255,0.25);
    position: relative;
    overflow: hidden;
    margin-bottom: 16px;
}
.auth-form .submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 50px rgba(0,212,255,0.35);
}
.auth-form .submit-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255,255,255,0.08), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}
.auth-form .submit-btn:hover::before { transform: translateX(100%); }
.auth-switch {
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
}
.auth-switch a {
    color: var(--neon-blue);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}
.auth-switch a:hover {
    color: var(--neon-purple);
    text-shadow: 0 0 12px rgba(0,212,255,0.3);
}
.agree-link {
    color: var(--neon-cyan) !important;
    text-decoration: underline;
}
.agree-link:hover {
    color: var(--neon-blue) !important;
}

/* Register form two columns */
#registerForm .form-row {
    margin-bottom: 16px;
}

/* Form Status */
.form-status {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 12px;
    display: none;
    text-align: center;
}

/* 输入框验证样式 */
.auth-form input:invalid:not(:placeholder-shown) {
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.auth-form input:valid {
    border-color: #10b981;
}

.auth-form input:focus:invalid:not(:placeholder-shown) {
    border-color: #ef4444;
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.auth-form input:focus:valid {
    border-color: #00d4ff;
    box-shadow: 0 0 0 3px rgba(0,212,255,0.1);
}

/* 验证错误提示 */
.validation-error {
    display: none;
    font-size: 12px;
    color: #ef4444;
    margin-top: 4px;
    padding: 4px 0;
    animation: fadeIn 0.3s ease;
}

.auth-form input.show-error + .validation-error {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.form-status.success {
    background: rgba(16, 185, 129, 0.1);
    color: #059669;
    border: 1px solid rgba(16, 185, 129, 0.2);
    display: block;
}

.form-status.error {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
    border: 1px solid rgba(239, 68, 68, 0.2);
    display: block;
}

/* Input Hint */
.input-hint {
    display: block;
    font-size: 12px;
    color: #9ca3af;
    margin-top: 4px;
    transition: color 0.3s ease;
}

/* Modal Responsive */
@media (max-width: 768px) {
    .modal-container {
        padding: 28px 20px;
        margin: 16px;
        max-height: 90vh;
    }
    .modal-header h2 {
        font-size: 22px;
    }
    .form-options {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
    #registerForm .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
}