/* ==================== 基础样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ==================== 粒子背景画布 ==================== */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -10;
    pointer-events: none;
}

/* ==================== 背景渐变 ==================== */
.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -9;
    background: radial-gradient(ellipse at top, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at bottom, rgba(236, 72, 153, 0.15) 0%, transparent 50%);
    animation: gradientPulse 15s ease-in-out infinite;
}

@keyframes gradientPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.6;
    }
}

/* ==================== 光晕效果 ==================== */
.glow-orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    z-index: -8;
    animation: float 20s ease-in-out infinite;
    pointer-events: none;
}

.glow-orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.6), transparent);
    top: -200px;
    left: -200px;
    animation-duration: 25s;
}

.glow-orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(236, 72, 153, 0.5), transparent);
    bottom: -150px;
    right: -150px;
    animation-duration: 30s;
    animation-delay: -5s;
}

.glow-orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.4), transparent);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-duration: 35s;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(50px, -50px) scale(1.1);
    }
    50% {
        transform: translate(-30px, 30px) scale(0.9);
    }
    75% {
        transform: translate(30px, 50px) scale(1.05);
    }
}

/* ==================== 音频波形装饰 ==================== */
.audio-wave-decoration {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px;
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    padding: 0 20%;
    z-index: -7;
    opacity: 0.3;
    pointer-events: none;
}

.wave-bar {
    width: 4px;
    background: linear-gradient(to top, var(--primary-color), var(--secondary-color));
    border-radius: 4px 4px 0 0;
    animation: waveHeight 1.5s ease-in-out infinite;
}

.wave-bar:nth-child(1) {
    height: 30px;
    animation-delay: 0s;
}

.wave-bar:nth-child(2) {
    height: 50px;
    animation-delay: 0.2s;
}

.wave-bar:nth-child(3) {
    height: 70px;
    animation-delay: 0.4s;
}

.wave-bar:nth-child(4) {
    height: 50px;
    animation-delay: 0.6s;
}

.wave-bar:nth-child(5) {
    height: 30px;
    animation-delay: 0.8s;
}

@keyframes waveHeight {
    0%, 100% {
        transform: scaleY(0.5);
    }
    50% {
        transform: scaleY(1.5);
    }
}

/* ==================== 导航栏 ==================== */
.navbar {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

/* Logo 图标包装器 */
.logo-icon-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon {
    width: 32px;
    height: 32px;
    position: relative;
    z-index: 2;
    animation: logoPulse 2s ease-in-out infinite;
    filter: drop-shadow(0 0 8px rgba(99, 102, 241, 0.6));
}

/* Logo 发光效果 */
.logo-glow {
    position: absolute;
    width: 50px;
    height: 50px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.4), transparent 70%);
    border-radius: 50%;
    animation: logoGlowPulse 2s ease-in-out infinite;
    z-index: 1;
}

@keyframes logoPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

@keyframes logoGlowPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.3);
        opacity: 1;
    }
}

.logo-icon-wrapper:hover .logo-icon {
    animation: logoSpin 0.6s ease-in-out;
}

@keyframes logoSpin {
    0% {
        transform: scale(1) rotate(0deg);
    }
    50% {
        transform: scale(1.2) rotate(180deg);
    }
    100% {
        transform: scale(1) rotate(360deg);
    }
}

.brand-name {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link:hover::after {
    width: 100%;
}

/* ==================== 主要内容 ==================== */
.main-content {
    padding: 3rem 0;
    min-height: calc(100vh - 80px);
}

/* Hero 区域 */
.hero-section {
    text-align: center;
    margin-bottom: 3rem;
    padding: 3rem 0;
    position: relative;
}

/* Hero Icon */
.hero-icon-wrapper {
    margin-bottom: 2rem;
    display: inline-block;
}

.hero-icon-circle {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(236, 72, 153, 0.2));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(20px);
    border: 2px solid rgba(99, 102, 241, 0.3);
    animation: heroIconFloat 3s ease-in-out infinite;
    box-shadow: 0 20px 60px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: visible;
}

.hero-icon {
    width: 60px;
    height: 60px;
    position: relative;
    z-index: 2;
    animation: heroIconPulse 2s ease-in-out infinite;
}

/* Hero 图标粒子效果 */
.hero-icon-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

.hero-icon-particles span {
    position: absolute;
    width: 6px;
    height: 6px;
    background: linear-gradient(135deg, #6366f1, #ec4899);
    border-radius: 50%;
    animation: heroParticleFloat 3s infinite ease-in-out;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.8);
}

.hero-icon-particles span:nth-child(1) {
    top: 10%;
    left: 50%;
    animation-delay: 0s;
}

.hero-icon-particles span:nth-child(2) {
    top: 50%;
    right: 10%;
    animation-delay: 0.5s;
}

.hero-icon-particles span:nth-child(3) {
    bottom: 10%;
    left: 50%;
    animation-delay: 1s;
}

.hero-icon-particles span:nth-child(4) {
    top: 50%;
    left: 10%;
    animation-delay: 1.5s;
}

@keyframes heroIconFloat {
    0%, 100% {
        transform: translateY(0) scale(1);
    }
    50% {
        transform: translateY(-20px) scale(1.05);
    }
}

@keyframes heroIconPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.9;
    }
}

@keyframes heroParticleFloat {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0;
    }
    50% {
        transform: translate(var(--tx, 20px), var(--ty, -20px)) scale(1.5);
        opacity: 1;
    }
}

.hero-icon-particles span:nth-child(1) {
    --tx: 0px;
    --ty: -30px;
}

.hero-icon-particles span:nth-child(2) {
    --tx: 30px;
    --ty: 0px;
}

.hero-icon-particles span:nth-child(3) {
    --tx: 0px;
    --ty: 30px;
}

.hero-icon-particles span:nth-child(4) {
    --tx: -30px;
    --ty: 0px;
}


.hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.animated-gradient {
    background: linear-gradient(90deg, 
        var(--primary-color) 0%, 
        var(--secondary-color) 50%, 
        var(--primary-color) 100%);
    background-size: 200% auto;
    animation: gradientShift 3s linear infinite;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@keyframes gradientShift {
    0% {
        background-position: 0% center;
    }
    100% {
        background-position: 200% center;
    }
}

.hero-subtitle-inline {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 0.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.typing-effect {
    color: var(--primary-light);
    font-weight: 600;
}

.hero-badges {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.badge {
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.badge-glow {
    position: relative;
    overflow: hidden;
}

.badge-glow::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: rotate(45deg);
    animation: badgeShine 3s infinite;
}

@keyframes badgeShine {
    0% {
        transform: translateX(-100%) translateY(-100%) rotate(45deg);
    }
    100% {
        transform: translateX(100%) translateY(100%) rotate(45deg);
    }
}

.badge:hover {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

.badge-icon {
    font-size: 1.2rem;
}


/* ==================== 转换器卡片 ==================== */
.converter-section {
    margin-bottom: 4rem;
}

/* 玻璃态卡片 */
.glass-card {
    background: rgba(30, 41, 59, 0.3);
    backdrop-filter: blur(30px);
    border: 1px solid rgba(99, 102, 241, 0.2);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.03), transparent);
    transition: left 0.5s ease;
}

.glass-card:hover::before {
    left: 100%;
}

.converter-card {
    background: rgba(30, 41, 59, 0.3);
    backdrop-filter: blur(30px);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3),
                0 0 40px rgba(99, 102, 241, 0.1);
    max-width: 700px;
    margin: 0 auto;
    transition: var(--transition);
}

.converter-card:hover {
    border-color: rgba(99, 102, 241, 0.4);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4),
                0 0 60px rgba(99, 102, 241, 0.2);
    transform: translateY(-5px);
}

.card-header {
    margin-bottom: 2rem;
}

.format-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
}

.format-box {
    position: relative;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(79, 70, 229, 0.3));
    backdrop-filter: blur(20px);
    padding: 1.5rem 2rem;
    border-radius: 16px;
    border: 2px solid rgba(99, 102, 241, 0.4);
    font-size: 1.5rem;
    font-weight: 700;
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    overflow: hidden;
}

.format-icon {
    font-size: 2rem;
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
}

.format-text {
    font-size: 1.5rem;
}

.format-particles {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
}

.format-particles span {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: particleFloat 3s infinite ease-in-out;
}

.format-particles span:nth-child(1) {
    left: 20%;
    top: 20%;
    animation-delay: 0s;
}

.format-particles span:nth-child(2) {
    left: 50%;
    top: 50%;
    animation-delay: 1s;
}

.format-particles span:nth-child(3) {
    left: 80%;
    top: 30%;
    animation-delay: 2s;
}

@keyframes particleFloat {
    0%, 100% {
        transform: translateY(0) scale(1);
        opacity: 0;
    }
    50% {
        transform: translateY(-20px) scale(1.5);
        opacity: 1;
    }
}

.format-box.to {
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.3), rgba(219, 39, 119, 0.3));
    border-color: rgba(236, 72, 153, 0.4);
    box-shadow: 0 10px 30px rgba(236, 72, 153, 0.3),
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.format-box:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.5),
                inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.format-box.to:hover {
    box-shadow: 0 15px 40px rgba(236, 72, 153, 0.5),
                inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.arrow-wrapper {
    position: relative;
}

.arrow-icon {
    width: 36px;
    height: 36px;
    color: var(--primary-light);
    animation: arrowPulse 2s infinite;
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
}

.arrow-trail {
    position: absolute;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    opacity: 0;
    animation: arrowTrail 2s infinite;
}

@keyframes arrowPulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1) translateX(0);
    }
    50% {
        opacity: 0.6;
        transform: scale(1.2) translateX(5px);
    }
}

@keyframes arrowTrail {
    0% {
        opacity: 0;
        transform: translateY(-50%) translateX(-20px);
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translateY(-50%) translateX(20px);
    }
}

/* ==================== 模式选择器 ==================== */
.mode-selector {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    background: var(--bg-secondary);
    padding: 0.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.mode-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.mode-btn svg {
    width: 20px;
    height: 20px;
}

.mode-btn:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--text-primary);
}

.mode-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* ==================== 输入组 ==================== */
.input-group {
    margin-bottom: 2rem;
}

.input-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.label-icon {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
}

.input-wrapper {
    position: relative;
}

.url-input {
    width: 100%;
    padding: 1rem 3rem 1rem 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
    outline: none;
}

.url-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.url-input::placeholder {
    color: var(--text-muted);
}

.clear-btn {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 6px;
    transition: var(--transition);
    display: none;
}

.clear-btn svg {
    width: 20px;
    height: 20px;
}

.clear-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.clear-btn.active {
    display: block;
}

.input-hint {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ==================== 文件上传区 ==================== */
.file-upload-area {
    position: relative;
}

.upload-placeholder {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: var(--bg-secondary);
}

.upload-placeholder:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.upload-placeholder.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    color: var(--text-muted);
}

.upload-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.upload-hint {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.file-preview {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border: 2px solid var(--primary-color);
    border-radius: 12px;
}

.file-icon {
    font-size: 3rem;
    line-height: 1;
}

.file-details {
    flex: 1;
}

.file-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    word-break: break-all;
}

.file-size {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.remove-file-btn {
    background: var(--bg-tertiary);
    border: none;
    border-radius: 8px;
    padding: 0.5rem;
    color: var(--error-color);
    cursor: pointer;
    transition: var(--transition);
}

.remove-file-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    transform: scale(1.1);
}

.remove-file-btn svg {
    width: 20px;
    height: 20px;
}

/* ==================== 转换按钮 ==================== */
.convert-btn {
    width: 100%;
    padding: 1.25rem;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border: none;
    border-radius: 12px;
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    box-shadow: 0 8px 16px rgba(99, 102, 241, 0.3);
}

.convert-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(99, 102, 241, 0.4);
}

.convert-btn:active {
    transform: translateY(0);
}

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

.btn-icon {
    width: 24px;
    height: 24px;
}

/* ==================== 加载状态 ==================== */
.loading-container {
    display: none;
    text-align: center;
    padding: 2rem 0;
    animation: fadeIn 0.3s ease;
}

.loading-container.active {
    display: block;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(99, 102, 241, 0.2);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 9999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0% {
        width: 0%;
    }
    50% {
        width: 70%;
    }
    100% {
        width: 100%;
    }
}

/* ==================== 结果容器 ==================== */
.result-container,
.error-container {
    display: none;
    animation: fadeIn 0.5s ease;
}

.result-container.active,
.error-container.active {
    display: block;
}

.result-success {
    text-align: center;
    padding: 2rem 0;
}

.success-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    color: var(--success-color);
    animation: scaleIn 0.5s ease;
}

.success-icon svg {
    width: 100%;
    height: 100%;
}

@keyframes scaleIn {
    from {
        transform: scale(0);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--success-color);
    margin-bottom: 0.5rem;
}

.result-message {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.file-info {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.info-item:last-child {
    border-bottom: none;
}

.info-label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.info-value {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.9rem;
    word-break: break-all;
}

.result-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.download-btn,
.copy-btn,
.new-btn {
    padding: 1rem;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.download-btn {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(16, 185, 129, 0.4);
}

.copy-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
}

.copy-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
}

.new-btn {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.new-btn:hover {
    background: rgba(99, 102, 241, 0.1);
}

.download-btn svg,
.copy-btn svg,
.new-btn svg {
    width: 20px;
    height: 20px;
}

/* ==================== 错误容器 ==================== */
.error-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    color: var(--error-color);
    animation: shake 0.5s ease;
}

.error-icon svg {
    width: 100%;
    height: 100%;
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-10px);
    }
    75% {
        transform: translateX(10px);
    }
}

.error-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--error-color);
    margin-bottom: 0.5rem;
    text-align: center;
}

.error-message {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    text-align: center;
}

.retry-btn {
    width: 100%;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--error-color);
    border-radius: 12px;
    color: var(--error-color);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.retry-btn:hover {
    background: rgba(239, 68, 68, 0.1);
}

/* ==================== 功能特点 ==================== */
.features-section {
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 4rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    position: relative;
}

.title-line {
    flex: 1;
    max-width: 150px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    position: relative;
}

.title-line::before {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 10px var(--primary-color);
    animation: titleDot 2s ease-in-out infinite;
}

@keyframes titleDot {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.5);
        opacity: 0.5;
    }
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: rgba(30, 41, 59, 0.3);
    backdrop-filter: blur(30px);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 20px;
    padding: 2.5rem 2rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(99, 102, 241, 0.1), transparent 50%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover::after {
    opacity: 1;
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: rgba(99, 102, 241, 0.4);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.3),
                0 0 20px rgba(99, 102, 241, 0.1);
}

.feature-icon-wrapper {
    position: relative;
    display: inline-block;
    margin-bottom: 1.5rem;
}

.feature-icon {
    font-size: 3.5rem;
    position: relative;
    z-index: 2;
    display: inline-block;
    animation: iconBounce 3s ease-in-out infinite;
}

@keyframes iconBounce {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    25% {
        transform: translateY(-10px) rotate(-5deg);
    }
    75% {
        transform: translateY(-5px) rotate(5deg);
    }
}

.feature-glow {
    position: absolute;
    width: 80px;
    height: 80px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.4), transparent 70%);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    filter: blur(20px);
    z-index: 1;
    animation: glowPulse 2s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.5;
    }
    50% {
        transform: translate(-50%, -50%) scale(1.3);
        opacity: 0.8;
    }
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==================== 使用教程 ==================== */
.how-to-section {
    margin-bottom: 4rem;
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.step-card {
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    text-align: center;
    flex: 1;
    min-width: 200px;
    max-width: 280px;
    transition: var(--transition);
}

.step-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
    box-shadow: 0 8px 16px rgba(99, 102, 241, 0.3);
}

.step-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.step-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.step-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: 700;
}

/* ==================== FAQ ==================== */
.faq-section {
    margin-bottom: 4rem;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: rgba(30, 41, 59, 0.5);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-color);
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.faq-question h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.faq-icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ==================== 页脚 ==================== */
.footer {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-text {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-link:hover {
    color: var(--primary-color);
}

/* ==================== Toast 提示 ==================== */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: rgba(30, 41, 59, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    color: var(--text-primary);
    font-weight: 500;
    box-shadow: var(--shadow-xl);
    transform: translateX(400px);
    transition: transform 0.3s ease;
    z-index: 1000;
    max-width: 300px;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.info {
    border-left: 4px solid var(--primary-color);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .nav-links {
        display: none;
    }

    .converter-card {
        padding: 1.5rem;
    }

    .format-box {
        padding: 0.75rem 1.5rem;
        font-size: 1.25rem;
    }

    .arrow-icon {
        width: 24px;
        height: 24px;
    }

    .section-title {
        font-size: 2rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .step-arrow {
        display: none;
    }

    .steps-container {
        flex-direction: column;
    }

    .step-card {
        max-width: 100%;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .toast {
        right: 1rem;
        left: 1rem;
        max-width: none;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .hero-badges {
        flex-direction: column;
        align-items: center;
    }

    .badge {
        width: 100%;
        text-align: center;
    }

    .format-indicator {
        flex-direction: column;
        gap: 1rem;
    }

    .arrow-icon {
        transform: rotate(90deg);
    }
}