/* ========================================
   Debear Party - Common Styles
   Includes: Global Variables, Reset Styles, Navbar, Buttons, Background, Responsive
   ======================================== */

/* ========== Global Reset ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ========== CSS Variables System ========== */
:root {
    /* Color System - Optimized Gradients and Neon Colors */
    --primary-gradient: linear-gradient(135deg, #00c4ef 0%, #e900e9 100%);
    --secondary-gradient: linear-gradient(135deg, #4dd0e1 0%, #d91e5a 100%);
    --neon-cyan: #00c4ef;
    --neon-pink: #e900e9;
    --neon-magenta: #d91e5a;
    
    /* Background Colors */
    --dark-bg: #0a0e1a;
    --dark-surface: #1a0a2e;
    --dark-purple: #2d1b4e;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b5c4e8;  /* Improved Contrast - WCAG AA Compliant (7:1) */
    --text-muted: #8595b8;      /* Improved Contrast for muted text */
    
    /* Grid and Effects */
    --grid-color: rgba(0, 196, 239, 0.12);
    --overlay-dark: rgba(0, 0, 0, 0.7);
    
    /* z-index Layer System - Unified Management */
    --z-background: -1;
    --z-content: 1;
    --z-dropdown: 50;
    --z-navbar: 100;
    --z-mobile-menu-overlay: 110;
    --z-mobile-menu: 120;
    --z-hamburger: 130;
    --z-toast: 200;
    --z-modal-overlay: 300;
    --z-modal: 310;
    
    /* Spacing System (8px base) */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 40px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 15px;
    --radius-xl: 20px;
    --radius-2xl: 25px;
    --radius-pill: 50px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 196, 239, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 196, 239, 0.3);
    --shadow-glow-cyan: 0 0 20px rgba(0, 196, 239, 0.5);
    --shadow-glow-pink: 0 0 20px rgba(233, 0, 233, 0.5);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Responsive Breakpoints */
    --breakpoint-mobile: 480px;
    --breakpoint-tablet: 768px;
    --breakpoint-desktop: 1024px;
    --breakpoint-wide: 1440px;
}

/* ========== Body Base Styles ========== */
body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== Particle Background ========== */
#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: var(--z-background);
    background: 
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        radial-gradient(ellipse at top, var(--dark-purple) 0%, var(--dark-surface) 50%, var(--dark-bg) 100%);
    background-size: 60px 60px, 60px 60px, 100% 100%;
    background-position: 0 0, 0 0, center center;
    will-change: transform;
}

/* Scanline Effect - Reduced Opacity for Performance */
#particles-js::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 196, 239, 0.01) 0px,
        transparent 2px,
        transparent 4px
    );
    pointer-events: none;
    animation: scan 12s linear infinite;
    will-change: transform;
}

@keyframes scan {
    0% { transform: translateY(0); }
    100% { transform: translateY(60px); }
}

/* ========== Navbar ========== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: var(--z-navbar);
    padding: var(--spacing-md) 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(10, 14, 26, 0.5);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 2px solid rgba(0, 196, 239, 0.2);
    box-shadow: 0 4px 24px rgba(0, 196, 239, 0.06);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    padding: var(--spacing-sm) 5%;
    background: rgba(10, 14, 26, 0.75);
    box-shadow: 0 4px 24px rgba(233, 0, 233, 0.12);
    border-bottom: 2px solid rgba(233, 0, 233, 0.25);
}

/* Logo */
.logo {
    font-size: 28px;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
    list-style: none;
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-normal);
    position: relative;
    padding: var(--spacing-xs) 0;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--neon-cyan);
    text-shadow: 0 0 8px rgba(0, 196, 239, 0.6);
}

.nav-menu a:focus-visible {
    outline: 2px solid var(--neon-cyan);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width var(--transition-normal);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

/* 导航按钮组 */
.nav-buttons {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

/* ========== 按钮样式 ========== */
/* 连接钱包按钮 */
.connect-btn {
    padding: 12px var(--spacing-lg);
    background: var(--primary-gradient);
    border: 2px solid transparent;
    border-radius: var(--radius-2xl);
    color: white;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 16px rgba(0, 196, 239, 0.4);
    font-size: 14px;
    white-space: nowrap;
}

.connect-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0, 196, 239, 0.6);
    border-color: rgba(255, 255, 255, 0.3);
}

.connect-btn:focus-visible {
    outline: 2px solid var(--neon-cyan);
    outline-offset: 2px;
}

.connect-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* 返回按钮 */
.nav-back {
    padding: 10px var(--spacing-md);
    background: transparent;
    border: 2px solid var(--neon-cyan);
    border-radius: var(--radius-xl);
    color: var(--neon-cyan);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-back:hover {
    background: var(--neon-cyan);
    color: white;
    box-shadow: var(--shadow-glow-cyan);
}

/* 主要按钮 */
.btn-primary {
    padding: var(--spacing-sm) var(--spacing-xl);
    background: var(--primary-gradient);
    border: 2px solid transparent;
    border-radius: var(--radius-2xl);
    color: white;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 6px 24px rgba(0, 196, 239, 0.35);
    font-size: 16px;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 196, 239, 0.5);
}

.btn-primary:focus-visible {
    outline: 2px solid var(--neon-cyan);
    outline-offset: 2px;
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* 次要按钮 */
.btn-secondary {
    padding: var(--spacing-sm) var(--spacing-xl);
    background: transparent;
    border: 2px solid var(--neon-pink);
    border-radius: var(--radius-2xl);
    color: var(--neon-pink);
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 0 16px rgba(233, 0, 233, 0.25);
    font-size: 16px;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-secondary:hover:not(:disabled) {
    background: var(--neon-pink);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 0 24px rgba(233, 0, 233, 0.5);
}

.btn-secondary:focus-visible {
    outline: 2px solid var(--neon-pink);
    outline-offset: 2px;
}

/* ========== 汉堡菜单 ========== */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: var(--z-hamburger);
    background: transparent;
    border: none;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: 2px;
    transition: all var(--transition-normal);
    box-shadow: 0 0 10px rgba(0, 196, 239, 0.5);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* 移动端返回按钮 */
.mobile-back {
    display: none;
    width: 40px;
    height: 40px;
    background: transparent;
    border: 2px solid var(--neon-cyan);
    border-radius: var(--radius-md);
    color: var(--neon-cyan);
    font-size: 20px;
    cursor: pointer;
    transition: all var(--transition-normal);
    align-items: center;
    justify-content: center;
}

.mobile-back:hover {
    background: var(--neon-cyan);
    color: white;
}

/* ========== 移动端菜单 ========== */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--overlay-dark);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: var(--z-mobile-menu-overlay);
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 2px solid rgba(0, 196, 239, 0.3);
    box-shadow: -4px 0 24px rgba(0, 196, 239, 0.2);
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-lg);
    transition: right 0.4s ease;
    z-index: var(--z-mobile-menu);
    overflow-y: auto;
}

.mobile-menu.active {
    right: 0;
}

.mobile-nav-links {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.mobile-nav-links li {
    margin: var(--spacing-md) 0;
}

.mobile-nav-links a,
.mobile-nav-links button {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 18px;
    font-weight: 600;
    display: block;
    padding: 12px 0;
    border: none;
    border-bottom: 1px solid rgba(0, 196, 239, 0.1);
    transition: all var(--transition-normal);
    background: transparent;
    width: 100%;
    text-align: left;
    cursor: pointer;
}

.mobile-nav-links a:hover,
.mobile-nav-links a.active,
.mobile-nav-links button:hover {
    color: var(--neon-cyan);
    text-shadow: 0 0 10px rgba(0, 196, 239, 0.8);
    padding-left: 10px;
}

.mobile-connect-btn {
    width: 100%;
    margin-top: var(--spacing-lg);
}

/* ========== Toast 提示系统 ========== */
.toast-container {
    position: fixed;
    top: 80px;
    right: var(--spacing-md);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 400px;
    pointer-events: none;
}

.toast {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    animation: slideInRight 0.3s ease;
    pointer-events: all;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 280px;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.info {
    background: rgba(0, 196, 239, 0.15);
    border: 2px solid rgba(0, 196, 239, 0.5);
    color: var(--neon-cyan);
}

.toast.success {
    background: rgba(0, 255, 136, 0.15);
    border: 2px solid rgba(0, 255, 136, 0.5);
    color: #00ff88;
}

.toast.error {
    background: rgba(255, 0, 100, 0.15);
    border: 2px solid rgba(255, 0, 100, 0.5);
    color: #ff0064;
}

.toast.warning {
    background: rgba(255, 170, 0, 0.15);
    border: 2px solid rgba(255, 170, 0, 0.5);
    color: #ffaa00;
}

/* ========== Loading 加载动画 ========== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 14, 26, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: none !important; /* 强制隐藏 */
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    transition: opacity var(--transition-normal);
    visibility: hidden; /* 额外保障 */
}

.loading-overlay.active {
    display: flex !important; /* 显示时覆盖默认隐藏 */
    opacity: 1;
    visibility: visible;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(0, 196, 239, 0.2);
    border-top: 4px solid var(--neon-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    box-shadow: 0 0 30px rgba(0, 196, 239, 0.5);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    position: absolute;
    margin-top: 100px;
    color: var(--text-secondary);
    font-size: 14px;
}

/* ========== 通用动画 ========== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 浮动动画 */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
}

/* 脉动动画 */
@keyframes pulse {
    0%, 100% { 
        transform: scale(1);
        opacity: 1;
    }
    50% { 
        transform: scale(1.05);
        opacity: 0.85;
    }
}

/* ========== 响应式设计 ========== */
/* 平板端 (≤1024px) */
@media (max-width: 1024px) {
    :root {
        --spacing-lg: 28px;
        --spacing-xl: 36px;
    }
}

/* 移动端 (≤768px) */
@media (max-width: 768px) {
    .navbar {
        padding: var(--spacing-sm) 5%;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hamburger {
        display: flex;
    }
    
    .navbar .connect-btn {
        display: none;
    }
    
    .mobile-back {
        display: flex;
    }
    
    .mobile-connect-btn {
        display: block;
    }
    
    .toast-container {
        right: var(--spacing-sm);
        left: var(--spacing-sm);
        max-width: none;
    }
    
    .toast {
        min-width: auto;
    }
}

/* 小屏手机 (≤480px) */
@media (max-width: 480px) {
    :root {
        --spacing-md: 16px;
        --spacing-lg: 24px;
        --spacing-xl: 32px;
    }
    
    .logo {
        font-size: 24px;
    }
    
    .mobile-menu {
        width: 100%;
        max-width: 320px;
    }
}

/* ========== 工具类 ========== */
.text-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}