:root {
    /* 莫兰迪色系 / Morandi Colors */
    --m-green: #A8B2A9;
    --m-green-dark: #7E8A7F;
    --m-beige: #D6D1CA;
    --m-blue: #A6B0B3;
    --m-pink: #D4A8A4;
    
    /* 材质系统 / Liquid Glass Materials */
    /* Light Mode */
    --glass-bg: rgba(255, 255, 255, 0.65);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-highlight: rgba(255, 255, 255, 0.8);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --glass-blur: blur(24px) saturate(160%);
    
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    
    --radius-l: 24px;
    --radius-m: 16px;
    --radius-s: 12px;
    
    --transition: 0.36s cubic-bezier(0.32, 0.72, 0, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        /* Dark Mode Glass */
        --glass-bg: rgba(30, 30, 30, 0.65);
        --glass-border: rgba(255, 255, 255, 0.12);
        --glass-highlight: rgba(255, 255, 255, 0.1);
        --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        --text-primary: #F5F5F7;
        --text-secondary: #86868B;
        --m-green: #7E8A7F; /* Darker in dark mode */
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: #F2F2F7;
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100svh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow-x: hidden;
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: #000000;
    }
}

/* Ambient Background Blobs - 营造Liquid Glass效果的关键背景 */
.ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s infinite ease-in-out alternate;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 50vw;
    height: 50vw;
    background: var(--m-green);
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 60vw;
    height: 60vw;
    background: var(--m-blue);
    animation-delay: -5s;
}

.blob-3 {
    top: 40%;
    left: 40%;
    width: 40vw;
    height: 40vw;
    background: var(--m-pink);
    animation-delay: -10s;
    opacity: 0.4;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(20px, 40px) scale(1.1); }
}

/* Glass Card Component */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: var(--radius-l);
    position: relative;
}

/* Container */
.container {
    width: 100%;
    max-width: 480px;
    padding: 40px 30px;
    transition: var(--transition);
    margin: auto;
}

/* Typography */
header {
    text-align: center;
    margin-bottom: 36px;
}

h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 16px;
}

/* License Plate Input Area */
.license-plate-container {
    margin-bottom: 24px;
}

.license-plate {
    display: flex;
    justify-content: center;
    gap: 6px;
    margin-bottom: 24px;
}

.plate-section {
    height: 52px;
    background: rgba(255, 255, 255, 0.4); /* 浅色填充 */
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

@media (prefers-color-scheme: dark) {
    .plate-section {
        background: rgba(255, 255, 255, 0.08);
        border-color: rgba(255, 255, 255, 0.05);
    }
}

.plate-section.active {
    background: rgba(255, 255, 255, 0.8);
    border-color: var(--m-green);
    box-shadow: 0 0 0 4px rgba(168, 178, 169, 0.25);
    transform: translateY(-2px);
}
@media (prefers-color-scheme: dark) {
    .plate-section.active {
        background: rgba(255, 255, 255, 0.2);
    }
}

.region { width: 48px; }
.letter, .number { width: 40px; }
.fixed { background: transparent; border: none; font-weight: 600; color: var(--m-green-dark); }
.plate-separator { font-weight: bold; color: var(--text-secondary); display: flex; align-items: center; }

input {
    width: 100%;
    height: 100%;
    background: transparent;
    border: none;
    text-align: center;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    outline: none;
    padding: 0;
}

/* Validation Messages */
.glass-message {
    text-align: center;
    padding: 12px;
    border-radius: var(--radius-m);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    background: rgba(0, 0, 0, 0.03);
    color: var(--text-secondary);
}

.glass-message.success {
    background: rgba(52, 199, 89, 0.15);
    color: #30A54A; /* Apple Green */
}

.glass-message.error {
    background: rgba(255, 59, 48, 0.15);
    color: #FF3B30; /* Apple Red */
}

/* Contact Info & Buttons */
.contact-info {
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
}

.contact-info.visible {
    opacity: 1;
    max-height: 200px;
    margin-top: 32px;
}

.info-container h2 {
    font-size: 18px;
    margin-bottom: 16px;
    text-align: center;
}

.glass-btn {
    border: none;
    outline: none;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-l);
    padding: 14px 24px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

.glass-btn.primary {
    background: var(--text-primary); /* Solid High Contrast */
    color: var(--glass-bg); /* Inverse Text */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

@media (prefers-color-scheme: dark) {
    .glass-btn.primary {
        background: #FFFFFF;
        color: #000000;
    }
}

.glass-btn.primary:active {
    transform: scale(0.98);
    opacity: 0.9;
}

.glass-btn.danger {
    background: rgba(255, 59, 48, 0.1);
    color: #FF3B30;
}

.glass-btn.small {
    padding: 6px 12px;
    font-size: 13px;
    width: auto;
    border-radius: 8px;
    background: rgba(120, 120, 128, 0.1);
    color: var(--text-primary);
}

/* Language Switcher (Floating Glass) */
.language-switcher {
    position: absolute;
    top: 24px;
    right: 24px;
    z-index: 100;
    padding: 4px;
    border-radius: 99px;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 99px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.lang-btn:hover {
    color: var(--text-primary);
}

.lang-btn.active {
    background: rgba(120, 120, 128, 0.15);
    color: var(--text-primary);
}

/* Footer */
footer {
    margin-top: 40px;
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    opacity: 0.6;
}

/* Mobile Keyboard (Glass Sheet) */
.mobile-keyboard {
    position: fixed;
    bottom: 16px;
    left: 10px;
    right: 10px;
    border-radius: var(--radius-l);
    padding: 10px 6px;
    padding-bottom: max(10px, env(safe-area-inset-bottom));
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transform: translateY(120%);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.1); /* 弹性动画 */
}

.mobile-keyboard.show {
    transform: translateY(0);
}

.keyboard-row {
    display: flex;
    gap: 6px;
    justify-content: center;
}

.key {
    flex: 1;
    height: 46px;
    border: none;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.6);
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 500;
    box-shadow: 0 1px 0 rgba(0,0,0,0.1);
    cursor: pointer;
    transition: background 0.1s;
    display: flex;
    align-items: center;
    justify-content: center;
}

@media (prefers-color-scheme: dark) {
    .key {
        background: rgba(255, 255, 255, 0.15);
        box-shadow: 0 1px 0 rgba(0,0,0,0.3);
    }
}

.key:active, .key.pressed {
    background: rgba(255, 255, 255, 0.9);
    transform: scale(0.95);
}
@media (prefers-color-scheme: dark) {
    .key:active, .key.pressed {
        background: rgba(255, 255, 255, 0.3);
    }
}

.key.action-key { flex: 1.5; background: rgba(160, 160, 160, 0.2); font-size: 16px; }
.key.done-key { flex: 2.5; background: var(--m-green); color: white; font-weight: 600; }
.key.disabled { opacity: 0.3; pointer-events: none; }

/* Debug Overlay */
.debug-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.debug-modal {
    width: 90%;
    max-width: 400px;
    padding: 24px;
    animation: modalPop 0.3s ease;
}

@keyframes modalPop {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.debug-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(120,120,120,0.1);
}

.glass-input {
    background: rgba(120,120,120,0.1);
    border: 1px solid rgba(120,120,120,0.1);
    border-radius: 8px;
    padding: 6px 12px;
    color: var(--text-primary);
    font-size: 14px;
}

/* Watermarks */
.watermark {
    position: fixed;
    pointer-events: none;
    color: var(--text-secondary);
    opacity: 0.4;
    font-size: 12px;
    z-index: 1;
}
.watermark-desktop { bottom: 10px; left: 0; width: 100%; text-align: center; }
.watermark-desktop-ip { top: 10px; left: 10px; font-family: monospace; }
.watermark-mobile { 
    top: -50%; left: -50%; width: 200%; height: 200%;
    transform: rotate(-30deg);
    display: grid;
    gap: 20px;
    opacity: 0.03;
}