:root { 
    --accent: #00f5d4; 
    --accent-2: #00bbf9; 
    --accent-3: #9b5de5;
    --accent-4: #f15bb5;
    --font-sans: "PingFang SC", "Lantinghei SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
    --font-serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
}

body { 
    background-color: var(--bg); 
    color: var(--text); 
    font-family: var(--font-sans); 
    transition: background 0.5s ease, color 0.5s ease;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.serif { 
    font-family: var(--font-serif); 
}

.light { 
    --bg: #f8f9fa; 
    --panel: rgba(255, 255, 255, 0.9); 
    --text: #1a1a2e; 
    --border: rgba(66, 90, 239, 0.3); 
    --item-bg: rgba(66, 90, 239, 0.05); 
    --card-shadow: rgba(66, 90, 239, 0.2);
    --accent: #425aef; 
    --accent-2: #5c62f2; 
    --accent-3: #826cf5;
    --accent-4: #a389f9;
    --accent-rgb: 66, 90, 239;
    --accent-2-rgb: 90, 74, 216;
    --accent-3-rgb: 107, 58, 216;
    --accent-4-rgb: 122, 43, 170;
    --morphing-bg: linear-gradient(-45deg, #e8eaf6, #c5cae9, #e8eaf6, #c5cae9);
}
.dark { 
    --bg: #050508; 
    --panel: rgba(15, 15, 25, 0.9); 
    --text: #e5e7eb; 
    --border: rgba(255, 200, 72, 0.3); 
    --item-bg: rgba(255, 200, 72, 0.05); 
    --card-shadow: rgba(255, 200, 72, 0.3);
    --accent: #ffc848; 
    --accent-2: #ffb347; 
    --accent-3: #ff9e40;
    --accent-4: #ff8938;
    --accent-rgb: 255, 200, 72;
    --accent-2-rgb: 255, 179, 71;
    --accent-3-rgb: 255, 158, 64;
    --accent-4-rgb: 255, 137, 56;
    --morphing-bg: linear-gradient(-45deg, #0a0a0f, #1a1a2e, #0a0a0f, #1a1a2e);
}

.glass-panel { 
    background: var(--panel); 
    backdrop-filter: blur(30px); 
    border: 1px solid var(--border);
    box-shadow: 0 0 40px rgba(var(--accent-rgb), 0.1);
}

#preview-overlay { 
    display: none; 
    background: rgba(0,0,0,0.98); 
    backdrop-filter: blur(30px); 
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
#preview-overlay.active { display: flex; animation: previewIn 0.35s cubic-bezier(0.4, 0, 0.2, 1); }
@keyframes previewIn { from { opacity: 0; transform: scale(0.9); } to { opacity: 1; transform: scale(1); } }

.aspect-16-9 { aspect-ratio: 16 / 9; }

.img-card { 
    position: relative; 
    background: var(--item-bg); 
    transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1); 
    border: 1px solid var(--border);
    transform-style: preserve-3d;
    perspective: 1000px;
}
.img-card:hover { 
    transform: translateY(-16px) rotateX(5deg) rotateY(-5deg) scale(1.05); 
    box-shadow: 0 30px 60px var(--card-shadow), 0 0 30px rgba(var(--accent-rgb), 0.3);
    border-color: var(--accent);
}
.img-card:hover .action-overlay { opacity: 1; }
.img-card:hover img { transform: scale(1.15) rotate(2deg); }

.file-checkbox {
    appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 0.375rem;
    background-color: rgba(255, 255, 255, 0.1);
    cursor: pointer;
    transition: all 0.2s ease;
}
.file-checkbox:checked {
    background-color: var(--accent);
    border-color: var(--accent);
}
.file-checkbox:checked::after {
    content: '✓';
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.75rem;
    font-weight: bold;
}
.file-checkbox:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: var(--accent);
}

.action-overlay {
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    background: linear-gradient(to top, rgba(0,0,0,0.95) 0%, rgba(0,0,0,0.7) 50%, transparent 100%);
}

#toast {
    position: fixed; bottom: 2rem; left: 50%; transform: translate(-50%, 150%);
    transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    z-index: 200;
}
#toast.show { transform: translate(-50%, 0); }

.upload-zone {
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}
.upload-zone:hover {
    border-color: var(--accent);
    transform: scale(1.02);
}
.upload-zone.dragover {
    border-color: var(--accent-2);
    transform: scale(1.05);
    box-shadow: 0 0 50px rgba(var(--accent-rgb), 0.5);
}

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

.btn-action {
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    overflow: hidden;
}
.btn-action::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}
.btn-action:hover::before {
    left: 100%;
}
.btn-action:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 10px 30px rgba(var(--accent-rgb), 0.4);
}

.geometric-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.geo-shape {
    position: absolute;
    opacity: 0.08;
    animation: geoFloat 25s ease-in-out infinite;
}

.geo-circle {
    border-radius: 50%;
    border: 2px solid var(--accent);
}

.geo-square {
    border: 2px solid var(--accent-2);
}

.geo-triangle {
    width: 0;
    height: 0;
    border-left: 40px solid transparent;
    border-right: 40px solid transparent;
    border-bottom: 70px solid var(--accent-3);
    opacity: 0.06;
}

.geo-shape:nth-child(1) {
    width: 120px;
    height: 120px;
    top: 10%;
    left: 5%;
    animation-delay: 0s;
}

.geo-shape:nth-child(2) {
    width: 80px;
    height: 80px;
    top: 60%;
    left: 15%;
    animation-delay: -5s;
}

.geo-shape:nth-child(3) {
    width: 100px;
    height: 100px;
    top: 20%;
    right: 10%;
    animation-delay: -10s;
}

.geo-shape:nth-child(4) {
    width: 60px;
    height: 60px;
    top: 70%;
    right: 20%;
    animation-delay: -15s;
}

.geo-shape:nth-child(5) {
    top: 40%;
    left: 40%;
    animation-delay: -8s;
}

.geo-shape:nth-child(6) {
    width: 90px;
    height: 90px;
    top: 80%;
    left: 60%;
    animation-delay: -12s;
}

.geo-shape:nth-child(7) {
    width: 70px;
    height: 70px;
    top: 15%;
    left: 70%;
    animation-delay: -3s;
}

.geo-shape:nth-child(8) {
    width: 50px;
    height: 50px;
    top: 50%;
    right: 5%;
    animation-delay: -18s;
}

@keyframes geoFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(20px, -30px) rotate(90deg); }
    50% { transform: translate(-15px, 20px) rotate(180deg); }
    75% { transform: translate(25px, 15px) rotate(270deg); }
}

.cursor-glow {
    position: fixed;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(var(--accent-rgb), 0.15) 0%, transparent 70%);
    pointer-events: none;
    z-index: 1;
    transform: translate(-50%, -50%);
    transition: opacity 0.3s;
}

.neon-text {
    text-shadow: 
        0 0 5px var(--accent),
        0 0 10px var(--accent),
        0 0 20px var(--accent),
        0 0 40px var(--accent);
    animation: neonPulse 2s ease-in-out infinite alternate;
}

@keyframes neonPulse {
    from { text-shadow: 0 0 5px var(--accent), 0 0 10px var(--accent), 0 0 20px var(--accent); }
    to { text-shadow: 0 0 10px var(--accent), 0 0 20px var(--accent), 0 0 40px var(--accent), 0 0 80px var(--accent); }
}

.typing-effect {
    overflow: hidden;
    border-right: 3px solid var(--accent);
    white-space: nowrap;
    animation: typing 3s steps(30) forwards, blink 0.75s step-end infinite, breathing 4s ease-in-out infinite;
}

.gradient-typing {
    background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3), var(--accent-4));
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 5s ease infinite;
}

@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}

@keyframes blink {
    50% { border-color: transparent; }
}

@keyframes breathing {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

.skeleton {
    background: linear-gradient(90deg, 
        rgba(255,255,255,0.05) 25%, 
        rgba(255,255,255,0.1) 50%, 
        rgba(255,255,255,0.05) 75%);
    background-size: 200% 100%;
    animation: skeleton 1.5s infinite;
}

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

.fade-in-up {
    animation: fadeInUp 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
    opacity: 0;
    transform: translateY(30px);
}

@keyframes fadeInUp {
    to { opacity: 1; transform: translateY(0); }
}

.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }

.rainbow-border {
    position: relative;
}
.rainbow-border::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(45deg, var(--accent), var(--accent-2), var(--accent-3), var(--accent-4), var(--accent));
    background-size: 400% 400%;
    border-radius: inherit;
    z-index: -1;
    animation: rainbow 3s ease infinite;
    opacity: 0;
    transition: opacity 0.3s;
}

@keyframes rainbow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.particle {
    position: absolute;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    pointer-events: none;
    animation: particleFloat 3s ease-out forwards;
}

@keyframes particleFloat {
    0% { transform: translate(0, 0) scale(1); opacity: 1; }
    100% { transform: translate(var(--tx), var(--ty)) scale(0); opacity: 0; }
}

.glow-button {
    position: relative;
}
.glow-button::after {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(45deg, var(--accent), var(--accent-2), var(--accent-3));
    filter: blur(10px);
    opacity: 0;
    transition: opacity 0.3s;
    z-index: -1;
    border-radius: inherit;
}
.glow-button:hover::after {
    opacity: 0.7;
}

.floating {
    animation: floating 3s ease-in-out infinite;
}

@keyframes floating {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.rotate-slow {
    animation: rotateSlow 20s linear infinite;
}

@keyframes rotateSlow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.pulse-ring {
    position: relative;
}
.pulse-ring::before,
.pulse-ring::after {
    content: '';
    position: absolute;
    inset: -4px;
    border: 2px solid var(--accent);
    border-radius: 50%;
    animation: pulseRing 2s ease-out infinite;
}
.pulse-ring::after {
    animation-delay: 1s;
}

@keyframes pulseRing {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(1.5); opacity: 0; }
}

.radar-scan {
    position: absolute;
    top: 35%;
    left: 50%;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 5;
}

.radar-scan::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;

    width: 1000px;
    height: 1000px;

    background: conic-gradient(
from 0deg,

/* 前缘亮线（收窄） */
rgba(var(--accent-rgb), 0.34) 0deg,
rgba(var(--accent-rgb), 0.26) 1.2deg,

/* 过渡到主体（更快） */
rgba(var(--accent-rgb), 0.16) 3deg,

/* 主体扫描扇面 */
rgba(var(--accent-rgb), 0.12) 18deg,

/* 尾部衰减 */
rgba(var(--accent-rgb), 0.05) 30deg,
transparent 40deg,
transparent 360deg
    );

    margin-top: -500px;
    margin-left: -500px;

    transform-origin: 50% 50%;
    animation: radarRotate 5s linear infinite;

    /* 模糊只作用在能量扩散上 */
    filter: blur(8px);

    border-radius: 50%;

    opacity: 0;
    transition: opacity 0.5s ease;
}

.upload-zone:hover .radar-scan::before {
    opacity: 1;
}

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

.gradient-text {
    background: linear-gradient(135deg, var(--accent), var(--accent-2), var(--accent-3), var(--accent-4));
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 5s ease infinite;
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.card-shine {
    position: relative;
    overflow: hidden;
}
.card-shine::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        to bottom right,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0) 40%,
        rgba(255, 255, 255, 0.1) 50%,
        rgba(255, 255, 255, 0) 60%,
        rgba(255, 255, 255, 0) 100%
    );
    transform: rotate(30deg);
    animation: shine 3s infinite;
    pointer-events: none;
}

@keyframes shine {
    0% { transform: translateX(-100%) rotate(30deg); }
    100% { transform: translateX(100%) rotate(30deg); }
}

.elastic-btn {
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.elastic-btn:hover {
    transform: scale(1.1);
}
.elastic-btn:active {
    transform: scale(0.95);
}

.magnetic {
    transition: transform 0.3s cubic-bezier(0.23, 1, 0.32, 1);
}

.scroll-indicator {
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

.glass-input {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(var(--accent-rgb), 0.2);
    transition: all 0.3s ease;
}
.glass-input:focus {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent);
    box-shadow: 0 0 20px rgba(var(--accent-rgb), 0.3);
    outline: none;
}

.morphing-bg {
    background: var(--morphing-bg);
    background-size: 400% 400%;
    animation: morphing 15s ease infinite;
}

@keyframes morphing {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}