/* ========================================
   2FA.fun - 全局样式系统
   设计风格：深色模式 + 霓虹科技感
   ======================================== */

/* CSS 变量 - 主题色 */
:root {
    /* 背景色 */
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a2235;
    --bg-card-hover: #212d45;
    
    /* 霓虹强调色 */
    --neon-cyan: #00f5d4;
    --neon-purple: #9b5de5;
    --neon-pink: #f15bb5;
    --neon-blue: #00bbf9;
    --neon-green: #00f093;
    
    /* 文字颜色 */
    --text-primary: #f0f4f8;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* 边框 */
    --border-color: rgba(148, 163, 184, 0.15);
    --border-glow: rgba(0, 245, 212, 0.3);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 字体 */
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(0, 245, 212, 0.2);
    
    /* 动画 */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* 重置样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* 背景网格效果 */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: 
        linear-gradient(rgba(0, 245, 212, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 245, 212, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: -1;
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: var(--spacing-md);
    left: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1000;
    background: rgba(26, 34, 53, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    color: var(--text-primary);
}

.logo-accent {
    color: var(--neon-cyan);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
}

.nav-link {
    display: block;
    padding: var(--spacing-xs) var(--spacing-md);
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--neon-cyan);
    background: rgba(0, 245, 212, 0.1);
}

/* 移动端导航 */
@media (max-width: 900px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(26, 34, 53, 0.95);
        backdrop-filter: blur(12px);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        margin-top: var(--spacing-xs);
        padding: var(--spacing-sm);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: var(--transition-normal);
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* ========================================
   主内容区
   ======================================== */
.main-content {
    flex: 1;
    padding: calc(80px + var(--spacing-xl)) var(--spacing-md) var(--spacing-xl);
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
}

/* ========================================
   页面标题
   ======================================== */
.page-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.page-title {
    font-size: clamp(1.75rem, 5vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--text-primary), var(--neon-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ========================================
   卡片组件
   ======================================== */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: var(--transition-normal);
}

.card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

/* 功能卡片 */
.feature-card {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    text-decoration: none;
    cursor: pointer;
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0, 245, 212, 0.15), rgba(155, 93, 229, 0.15));
    border-radius: var(--radius-md);
    font-size: 1.5rem;
}

.feature-card:nth-child(2) .feature-icon {
    background: linear-gradient(135deg, rgba(0, 187, 249, 0.15), rgba(0, 245, 212, 0.15));
}

.feature-card:nth-child(3) .feature-icon {
    background: linear-gradient(135deg, rgba(241, 91, 181, 0.15), rgba(155, 93, 229, 0.15));
}

.feature-card:nth-child(4) .feature-icon {
    background: linear-gradient(135deg, rgba(0, 240, 147, 0.15), rgba(0, 187, 249, 0.15));
}

.feature-card:nth-child(5) .feature-icon {
    background: linear-gradient(135deg, rgba(155, 93, 229, 0.15), rgba(241, 91, 181, 0.15));
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.feature-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ========================================
   表单元素
   ======================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    transition: var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--neon-cyan);
    box-shadow: 0 0 0 3px rgba(0, 245, 212, 0.15);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-muted);
}

.form-textarea {
    min-height: 150px;
    resize: vertical;
    line-height: 1.6;
}

/* ========================================
   按钮
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
    color: var(--bg-primary);
}

.btn-primary:hover {
    box-shadow: 0 0 20px rgba(0, 245, 212, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--neon-cyan);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.25);
}

.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========================================
   验证码显示区
   ======================================== */
.otp-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-xl);
}

.otp-code {
    font-family: var(--font-mono);
    font-size: clamp(2.5rem, 10vw, 4rem);
    font-weight: 700;
    letter-spacing: 0.5rem;
    color: var(--neon-cyan);
    text-shadow: 0 0 30px rgba(0, 245, 212, 0.5);
    cursor: pointer;
    user-select: all;
    transition: var(--transition-fast);
}

.otp-code:hover {
    text-shadow: 0 0 40px rgba(0, 245, 212, 0.7);
}

/* 倒计时进度环 */
.countdown-ring {
    position: relative;
    width: 80px;
    height: 80px;
}

.countdown-ring svg {
    transform: rotate(-90deg);
}

.countdown-ring circle {
    fill: none;
    stroke-width: 4;
}

.countdown-ring .bg {
    stroke: var(--border-color);
}

.countdown-ring .progress {
    stroke: var(--neon-cyan);
    stroke-linecap: round;
    transition: stroke-dashoffset 1s linear;
}

.countdown-text {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ========================================
   结果列表
   ======================================== */
.result-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

@media (max-width: 768px) {
    .result-container {
        grid-template-columns: 1fr;
    }
}

.result-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
}

.result-title {
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.result-count {
    font-family: var(--font-mono);
    color: var(--neon-cyan);
}

.result-body {
    padding: var(--spacing-md);
    min-height: 200px;
    max-height: 400px;
    overflow-y: auto;
}

.result-item {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-xs);
    background: rgba(0, 0, 0, 0.2);
}

.result-item.success {
    border-left: 3px solid var(--neon-green);
}

.result-item.error {
    border-left: 3px solid #ef4444;
}

/* ========================================
   工具按钮组
   ======================================== */
.tool-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.tool-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8125rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.tool-btn:hover {
    color: var(--neon-cyan);
    border-color: var(--neon-cyan);
    background: rgba(0, 245, 212, 0.1);
}

/* ========================================
   笔记分享
   ======================================== */
.note-editor {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.password-strength {
    display: flex;
    gap: 4px;
    margin-top: var(--spacing-xs);
}

.password-strength span {
    flex: 1;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    transition: var(--transition-fast);
}

.password-strength.weak span:nth-child(1) {
    background: #ef4444;
}

.password-strength.medium span:nth-child(1),
.password-strength.medium span:nth-child(2) {
    background: #f59e0b;
}

.password-strength.strong span:nth-child(1),
.password-strength.strong span:nth-child(2),
.password-strength.strong span:nth-child(3) {
    background: #22c55e;
}

.password-strength.very-strong span {
    background: var(--neon-cyan);
}

.share-link {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    word-break: break-all;
    color: var(--neon-cyan);
}

/* ========================================
   Toast 通知
   ======================================== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-color: var(--neon-green);
}

.toast.error {
    border-color: #ef4444;
}

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

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

/* ========================================
   底部
   ======================================== */
.footer {
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-note {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
}

/* ========================================
   工具类
   ======================================== */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ========================================
   加载状态
   ======================================== */
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--neon-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ========================================
   响应式优化
   ======================================== */
@media (max-width: 640px) {
    .main-content {
        padding-left: var(--spacing-sm);
        padding-right: var(--spacing-sm);
    }
    
    .card {
        padding: var(--spacing-lg);
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .otp-code {
        letter-spacing: 0.25rem;
    }
}