:root {
    --bg-warm: #FDF8F5;
    --bg-gradient: linear-gradient(135deg, #FDF8F5 0%, #F5E6E8 50%, #E8D5E5 100%);
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(255, 255, 255, 0.8);
    --accent-rose: #E8B4B8;
    --accent-mint: #B5D5C5;
    --accent-lavender: #C5B5D5;
    --text-primary: #4A4A4A;
    --text-secondary: #7A7A7A;
    --shadow-soft: 0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.06);
    --radius-lg: 20px;
    --radius-md: 12px;
    --font-display: 'Cormorant Garamond', serif;
    --font-body: 'Nunito', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background: var(--bg-gradient);
    min-height: 100vh;
    color: var(--text-primary);
}

.app {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

body {
    background: var(--bg-gradient);
    background-attachment: fixed;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(232, 180, 184, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(181, 213, 197, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(197, 181, 213, 0.1) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.header {
    text-align: center;
    margin-bottom: 40px;
}

.header h1 {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.02em;
}

.header h1::before {
    content: '✧ ';
    color: var(--accent-rose);
}

.header h1::after {
    content: ' ✧';
    color: var(--accent-mint);
}

.uuid-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    box-shadow: var(--shadow-card);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.uuid-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 32px;
}

input[type="number"] {
    padding: 12px 16px;
    border: 2px solid var(--card-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-body);
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    width: 100px;
    text-align: center;
    transition: border-color 0.2s;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-rose);
}

input[type="number"].error {
    border-color: #E74C3C;
    animation: shake 0.3s ease;
}

button {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: var(--font-body);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

#generate-btn {
    background: var(--accent-rose);
    color: white;
}

#generate-btn:hover {
    background: #D9A3A7;
    transform: translateY(-1px);
}

#random-copy-btn,
#download-txt-btn,
#download-json-btn {
    background: var(--card-bg);
    backdrop-filter: blur(8px);
    border: 2px solid var(--card-border);
    color: var(--text-primary);
}

#random-copy-btn:hover,
#download-txt-btn:hover,
#download-json-btn:hover {
    border-color: var(--accent-mint);
    background: rgba(181, 213, 197, 0.2);
}

.uuid-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.uuid-text {
    font-family: 'SF Mono', 'Fira Code', monospace;
    font-size: 1.1rem;
    color: var(--text-primary);
    letter-spacing: 0.05em;
}

.copy-btn {
    padding: 8px 16px;
    background: var(--accent-mint);
    color: white;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
}

.copy-btn:hover {
    background: #9FC5B5;
}

.music-player {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 16px 20px;
    box-shadow: var(--shadow-soft);
    display: flex;
    align-items: center;
    gap: 16px;
    z-index: 1000;
}

.player-info {
    min-width: 120px;
    text-align: center;
}

.track-name {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px;
    display: inline-block;
}

.player-controls {
    display: flex;
    gap: 8px;
}

.player-btn {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-lavender);
    color: white;
    border-radius: 50%;
    font-size: 0.9rem;
}

#volume {
    width: 80px;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--card-border);
    border-radius: 3px;
    cursor: pointer;
}

.volume-display {
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-width: 32px;
    text-align: center;
}

#volume::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent-rose);
    border-radius: 50%;
    cursor: pointer;
}

@media (max-width: 600px) {
    .header h1 {
        font-size: 2rem;
    }

    .controls {
        flex-direction: column;
        align-items: stretch;
    }

    input[type="number"] {
        width: 100%;
    }

    button {
        width: 100%;
    }

    .uuid-card {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .music-player {
        bottom: 12px;
        right: 12px;
        left: 12px;
        justify-content: center;
    }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

.player-btn:hover {
    transform: scale(1.1);
    transition: transform 0.15s ease;
}

.player-btn:active {
    transform: scale(0.95);
}

.music-player {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.music-player:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.music-player.playing .player-btn:first-child {
    animation: pulse 1.5s infinite;
}

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

.app {
    animation: fadeIn 0.6s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.uuid-card {
    animation: slideIn 0.3s ease;
    animation-fill-mode: both;
}

.uuid-card:nth-child(1) { animation-delay: 0ms; }
.uuid-card:nth-child(2) { animation-delay: 50ms; }
.uuid-card:nth-child(3) { animation-delay: 100ms; }
.uuid-card:nth-child(4) { animation-delay: 150ms; }
.uuid-card:nth-child(5) { animation-delay: 200ms; }

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-top: -24px;
    margin-bottom: 32px;
}

.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: 12px 24px;
    box-shadow: var(--shadow-soft);
    font-size: 0.95rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1001;
}

.toast.show {
    opacity: 1;
}