/* ─────────────────────────────────────────────────────────────
   Suno Writer by Myind Sound
   Apple-inspired dark UI with gold accent system
   ───────────────────────────────────────────────────────────── */

:root {
    --bg-primary: #08080A;
    --bg-secondary: #111114;
    --bg-tertiary: #1A1A1F;
    --bg-elevated: #22222A;
    --bg-hover: #2A2A34;
    --bg-input: #131316;
    --gold: #FDB913;
    --gold-dim: rgba(253, 185, 19, 0.1);
    --gold-hover: #FFD54F;
    --orange: #FF8C00;
    --accent-glow: rgba(253, 185, 19, 0.06);
    --text-primary: #F0F0F5;
    --text-secondary: rgba(240, 240, 245, 0.55);
    --text-tertiary: rgba(240, 240, 245, 0.3);
    --border: rgba(255, 255, 255, 0.06);
    --border-subtle: rgba(255, 255, 255, 0.03);
    --border-focus: rgba(253, 185, 19, 0.4);
    --success: #34C759;
    --error: #FF3B30;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 30px rgba(253, 185, 19, 0.08);
    --transition: 250ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    --sidebar-width: 280px;
}

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

html, body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(253, 185, 19, 0.02) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(255, 140, 0, 0.015) 0%, transparent 50%);
}

/* ─── App Layout ─────────────────────────────────────────── */

.app {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* ─── Sidebar ────────────────────────────────────────────── */

.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-slow), opacity var(--transition-slow);
    z-index: 100;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.sidebar.collapsed {
    transform: translateX(-100%);
    opacity: 0;
    position: absolute;
    height: 100%;
}

.sidebar-header {
    padding: 24px 20px 16px;
    border-bottom: 1px solid var(--border);
}

.logo {
    height: 28px;
    width: auto;
    opacity: 0.95;
}

.sidebar-section {
    padding: 16px 12px;
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.section-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1.2px;
    color: var(--text-tertiary);
    padding: 0 8px;
    margin-bottom: 8px;
    text-transform: uppercase;
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 10px 12px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    text-align: left;
    position: relative;
    overflow: hidden;
}

.mode-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--gold-dim), transparent);
    opacity: 0;
    transition: opacity var(--transition);
    border-radius: inherit;
}

.mode-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    transform: translateX(4px);
}

.mode-btn:hover::before {
    opacity: 0.5;
}

.mode-btn.active {
    background: var(--gold-dim);
    color: var(--gold);
    border-color: rgba(253, 185, 19, 0.2);
    box-shadow: inset 0 0 20px rgba(253, 185, 19, 0.05);
}

.mode-btn.active::before {
    opacity: 1;
}

.mode-btn.active svg {
    stroke: var(--gold);
    filter: drop-shadow(0 0 4px rgba(253, 185, 19, 0.4));
}

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    margin-bottom: 8px;
}

.new-chat-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.15);
}

.chat-history {
    flex: 1;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-hover) transparent;
}

.chat-history-item {
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-history-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.chat-history-item.active {
    background: var(--gold-dim);
    color: var(--gold);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-tertiary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-dot.online {
    background: var(--success);
    box-shadow: 0 0 6px rgba(52, 199, 89, 0.5);
}

.status-dot.offline {
    background: var(--error);
    box-shadow: 0 0 6px rgba(255, 59, 48, 0.5);
}

.status-dot.loading {
    background: var(--gold);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ─── Main Content ───────────────────────────────────────── */

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--bg-primary);
}

/* ─── Top Bar ────────────────────────────────────────────── */

.topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border);
    background: rgba(13, 13, 13, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    min-height: 52px;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: color var(--transition);
}

.sidebar-toggle:hover {
    color: var(--text-primary);
}

.topbar-title {
    flex: 1;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.topbar-actions {
    display: flex;
    gap: 4px;
}

.icon-btn {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

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

/* ─── Chat Area ──────────────────────────────────────────── */

.chat-area {
    flex: 1;
    overflow-y: auto;
    padding: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--bg-hover) transparent;
}

.chat-area::-webkit-scrollbar {
    width: 6px;
}

.chat-area::-webkit-scrollbar-track {
    background: transparent;
}

.chat-area::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: 3px;
}

/* ─── Welcome Screen ─────────────────────────────────────── */

.welcome-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    padding: 40px 24px;
    text-align: center;
    animation: welcomeFade 800ms var(--transition-slow) both;
}

@keyframes welcomeFade {
    from { opacity: 0; transform: translateY(20px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.welcome-screen.hidden {
    display: none;
}

.welcome-icon {
    width: 96px;
    height: 96px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle, var(--gold-dim), transparent);
    border-radius: 28px;
    margin-bottom: 24px;
    color: var(--gold);
    animation: iconFloat 4s ease-in-out infinite;
    position: relative;
}

.welcome-icon::after {
    content: '';
    position: absolute;
    inset: -8px;
    border-radius: 32px;
    background: radial-gradient(circle, rgba(253, 185, 19, 0.08), transparent 70%);
    animation: iconPulse 3s ease-in-out infinite;
}

@keyframes iconFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

@keyframes iconPulse {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.1); }
}

.welcome-screen h1 {
    font-size: 36px;
    font-weight: 900;
    letter-spacing: -0.04em;
    margin-bottom: 4px;
    background: linear-gradient(135deg, #FFD54F, var(--gold), var(--orange));
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 6s ease-in-out infinite;
}

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

.welcome-sub {
    font-size: 14px;
    color: var(--text-tertiary);
    font-weight: 500;
    margin-bottom: 28px;
    letter-spacing: 0.02em;
}

.welcome-message {
    max-width: 480px;
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 32px;
    text-align: left;
    white-space: pre-line;
}

.welcome-message strong {
    color: var(--gold);
    font-weight: 600;
}

.quick-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    max-width: 480px;
    width: 100%;
}

.quick-btn {
    padding: 14px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    text-align: left;
    position: relative;
    overflow: hidden;
}

.quick-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(253, 185, 19, 0.05), transparent);
    transition: left 0.5s ease;
}

.quick-btn:hover {
    background: var(--bg-tertiary);
    border-color: rgba(253, 185, 19, 0.25);
    color: var(--gold);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 20px rgba(253, 185, 19, 0.06);
}

.quick-btn:hover::before {
    left: 100%;
}

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

/* ─── Messages ───────────────────────────────────────────── */

.messages {
    padding: 24px 0;
}

.message {
    padding: 16px 24px;
    max-width: 800px;
    margin: 0 auto;
    animation: slideUp 400ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(16px); filter: blur(4px); }
    to { opacity: 1; transform: translateY(0); filter: blur(0); }
}

.message.user {
    padding: 12px 24px;
}

.message.user .message-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 14px 18px;
    display: inline-block;
    max-width: 85%;
    float: right;
    clear: both;
    font-size: 14px;
    line-height: 1.6;
}

.message.assistant .message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.message.assistant .avatar {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--gold), var(--orange));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.message.assistant .avatar svg {
    width: 16px;
    height: 16px;
    stroke: var(--bg-primary);
}

.message.assistant .avatar-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.message.assistant .message-content {
    font-size: 14px;
    line-height: 1.75;
    color: var(--text-primary);
    padding-left: 36px;
}

.message.assistant .message-content h1,
.message.assistant .message-content h2,
.message.assistant .message-content h3 {
    color: var(--gold);
    margin-top: 20px;
    margin-bottom: 8px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.message.assistant .message-content h1 { font-size: 20px; }
.message.assistant .message-content h2 { font-size: 17px; }
.message.assistant .message-content h3 { font-size: 15px; }

.message.assistant .message-content p {
    margin-bottom: 12px;
}

.message.assistant .message-content strong {
    color: var(--gold);
    font-weight: 600;
}

.message.assistant .message-content em {
    color: var(--text-secondary);
}

.message.assistant .message-content ul,
.message.assistant .message-content ol {
    padding-left: 20px;
    margin-bottom: 12px;
}

.message.assistant .message-content li {
    margin-bottom: 4px;
}

.message.assistant .message-content code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    color: var(--gold);
}

.message.assistant .message-content pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin: 4px 0 16px 0;
    overflow-x: auto;
    position: relative;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message.assistant .message-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
    font-size: 13px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message.assistant .message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 13px;
}

.message.assistant .message-content th {
    background: var(--bg-tertiary);
    color: var(--gold);
    font-weight: 600;
    text-align: left;
    padding: 10px 12px;
    border: 1px solid var(--border);
}

.message.assistant .message-content td {
    padding: 8px 12px;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

/* Copy button on code blocks */
.prompt-label {
    font-size: 13px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--gold);
    margin-top: 16px;
    margin-bottom: 6px;
    padding: 8px 14px;
    background: linear-gradient(135deg, rgba(253, 185, 19, 0.1), rgba(255, 140, 0, 0.06));
    border-left: 3px solid var(--gold);
    border-radius: 0 8px 8px 0;
    display: inline-block;
    box-shadow: 0 0 20px rgba(253, 185, 19, 0.05);
    animation: labelGlow 3s ease-in-out infinite alternate;
}

@keyframes labelGlow {
    from { box-shadow: 0 0 12px rgba(253, 185, 19, 0.04); }
    to { box-shadow: 0 0 24px rgba(253, 185, 19, 0.1); }
}

.copy-block {
    position: relative;
}

.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--bg-hover);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-tertiary);
    cursor: pointer;
    padding: 4px 8px;
    font-size: 11px;
    font-family: inherit;
    font-weight: 500;
    transition: all var(--transition);
    opacity: 0;
}

.copy-block:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background: var(--gold-dim);
    color: var(--gold);
    border-color: rgba(253, 185, 19, 0.3);
}

.copy-btn.copied {
    background: rgba(52, 199, 89, 0.15);
    color: var(--success);
    border-color: rgba(52, 199, 89, 0.3);
}

/* Loading dots */
.loading-dots {
    display: flex;
    gap: 4px;
    padding-left: 36px;
    padding-top: 4px;
}

.loading-dots span {
    width: 6px;
    height: 6px;
    background: var(--gold);
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite;
}

.loading-dots span:nth-child(2) { animation-delay: 0.16s; }
.loading-dots span:nth-child(3) { animation-delay: 0.32s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.3; }
    40% { transform: scale(1); opacity: 1; }
}

/* ─── Audio Banner ───────────────────────────────────────── */

.audio-banner {
    padding: 0 24px;
    transition: all var(--transition);
}

.audio-banner.hidden {
    display: none;
}

.audio-banner-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: var(--gold-dim);
    border: 1px solid rgba(253, 185, 19, 0.25);
    border-radius: var(--radius-md);
    color: var(--gold);
    font-size: 12px;
    font-weight: 500;
}

.audio-banner-content svg {
    flex-shrink: 0;
    stroke: var(--gold);
}

.audio-banner-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.audio-banner-clear {
    background: none;
    border: none;
    color: var(--gold);
    cursor: pointer;
    padding: 2px;
    border-radius: 4px;
    opacity: 0.6;
    transition: opacity var(--transition);
    flex-shrink: 0;
}

.audio-banner-clear:hover {
    opacity: 1;
}

.audio-banner.analyzing .audio-banner-text::after {
    content: '';
    display: inline-block;
    width: 12px;
    height: 12px;
    border: 2px solid var(--gold);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-left: 8px;
    vertical-align: middle;
}

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

/* ─── Upload Button ──────────────────────────────────────── */

.upload-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    cursor: pointer;
    color: var(--text-tertiary);
    transition: all var(--transition);
    flex-shrink: 0;
}

.upload-btn:hover {
    color: var(--gold);
    background: var(--gold-dim);
}

.upload-btn.has-audio {
    color: var(--gold);
    background: var(--gold-dim);
}

.upload-btn.analyzing {
    animation: spin-pulse 1s linear infinite;
    color: var(--gold);
    pointer-events: none;
}

@keyframes spin-pulse {
    0% { opacity: 1; }
    50% { opacity: 0.4; }
    100% { opacity: 1; }
}

/* ─── Input Area ─────────────────────────────────────────── */

.input-area {
    padding: 16px 24px 20px;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
}

.input-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: flex-end;
    gap: 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 8px 12px 8px 16px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.input-container:focus-within {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(253, 185, 19, 0.08), var(--shadow-glow);
}

textarea {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    line-height: 1.5;
    resize: none;
    max-height: 160px;
    padding: 6px 0;
}

textarea::placeholder {
    color: var(--text-tertiary);
}

.send-btn {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: none;
    background: var(--bg-hover);
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    flex-shrink: 0;
}

.send-btn:not(:disabled) {
    background: linear-gradient(135deg, var(--gold), var(--orange));
    color: var(--bg-primary);
    box-shadow: 0 0 16px rgba(253, 185, 19, 0.25);
}

.send-btn:not(:disabled):hover {
    background: linear-gradient(135deg, var(--gold-hover), var(--gold));
    transform: scale(1.08);
    box-shadow: 0 0 24px rgba(253, 185, 19, 0.35);
}

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

.input-footer {
    text-align: center;
    font-size: 11px;
    color: var(--text-tertiary);
    margin-top: 8px;
    letter-spacing: 0.02em;
}

/* ─── Responsive ─────────────────────────────────────────── */

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        height: 100%;
        transform: translateX(-100%);
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-toggle {
        display: block;
    }

    .quick-actions {
        grid-template-columns: 1fr;
    }

    .message.user .message-content {
        max-width: 95%;
    }

    .welcome-screen h1 {
        font-size: 26px;
    }
}

@media (max-width: 480px) {
    .input-area {
        padding: 12px 12px 16px;
    }

    .message {
        padding: 12px 16px;
    }

    .topbar {
        padding: 12px 16px;
    }
}

/* ─── Overlay for mobile sidebar ─────────────────────────── */

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 99;
    backdrop-filter: blur(4px);
}

.sidebar-overlay.active {
    display: block;
}

/* ─── Upload Modal ──────────────────────────────────────── */

.upload-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    animation: overlayIn 300ms ease both;
}

.upload-overlay.hidden {
    display: none;
}

.upload-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    max-width: 520px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg), 0 0 60px rgba(253, 185, 19, 0.06);
    animation: modalIn 400ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.upload-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 24px 28px 16px;
    border-bottom: 1px solid var(--border);
}

.upload-modal-header h2 {
    font-size: 18px;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--text-primary), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.upload-modal-close {
    background: none;
    border: none;
    color: var(--text-tertiary);
    font-size: 24px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    line-height: 1;
}

.upload-modal-close:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.upload-modal-body {
    padding: 20px 28px 28px;
}

.upload-mode-info {
    margin-bottom: 20px;
    padding: 14px 16px;
    background: var(--gold-dim);
    border: 1px solid rgba(253, 185, 19, 0.15);
    border-radius: var(--radius-md);
}

.upload-mode-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gold);
    background: rgba(253, 185, 19, 0.15);
    padding: 4px 10px;
    border-radius: 6px;
    margin-bottom: 8px;
}

.upload-mode-info p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.upload-mode-info p strong {
    color: var(--gold);
}

.upload-instructions {
    margin-bottom: 20px;
}

.upload-instructions h3,
.upload-specs h3 {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.upload-instructions ul {
    padding-left: 0;
    list-style: none;
}

.upload-instructions li {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.65;
    margin-bottom: 8px;
    padding-left: 16px;
    position: relative;
}

.upload-instructions li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gold);
    opacity: 0.6;
}

.upload-instructions li strong {
    color: var(--text-primary);
}

.upload-specs {
    margin-bottom: 20px;
}

.format-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.format-tag {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    padding: 4px 10px;
    border-radius: 6px;
    letter-spacing: 0.04em;
}

.upload-limits {
    font-size: 12px;
    color: var(--text-tertiary);
    line-height: 1.7;
}

.upload-limits p {
    margin-bottom: 4px;
}

.upload-limits strong {
    color: var(--text-secondary);
}

.upload-dropzone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 32px 24px;
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    color: var(--text-tertiary);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
    border-color: var(--gold);
    background: var(--gold-dim);
    color: var(--gold);
}

.upload-dropzone.dragover {
    transform: scale(1.02);
}

.upload-dropzone svg {
    opacity: 0.5;
    transition: opacity var(--transition);
}

.upload-dropzone:hover svg,
.upload-dropzone.dragover svg {
    opacity: 1;
    stroke: var(--gold);
}

.upload-dropzone p {
    font-size: 14px;
    font-weight: 500;
}

.upload-dropzone span {
    font-size: 12px;
    opacity: 0.5;
}

.upload-browse-btn {
    padding: 8px 20px;
    background: linear-gradient(135deg, var(--gold), var(--orange));
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 13px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
}

.upload-browse-btn:hover {
    box-shadow: 0 0 20px rgba(253, 185, 19, 0.3);
    transform: translateY(-1px);
}

.upload-error {
    margin-top: 12px;
    padding: 10px 14px;
    background: rgba(255, 59, 48, 0.1);
    border: 1px solid rgba(255, 59, 48, 0.2);
    border-radius: var(--radius-sm);
    color: var(--error);
    font-size: 13px;
    font-weight: 500;
}

.upload-error.hidden {
    display: none;
}

/* ─── Terms & Conditions Modal ──────────────────────────── */

.terms-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    animation: overlayIn 400ms ease both;
}

.terms-overlay.hidden {
    display: none;
}

.terms-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    max-width: 600px;
    width: 100%;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg), 0 0 80px rgba(253, 185, 19, 0.06);
    animation: modalIn 500ms cubic-bezier(0.16, 1, 0.3, 1) both;
    overflow: hidden;
}

.terms-modal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--gold), var(--orange), transparent);
}

.terms-header {
    padding: 28px 32px 20px;
    text-align: center;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.terms-header h2 {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin: 12px 0 4px;
    background: linear-gradient(135deg, var(--text-primary), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.terms-header p {
    font-size: 13px;
    color: var(--text-tertiary);
}

.terms-content {
    flex: 1;
    overflow-y: auto;
    padding: 24px 32px;
    font-size: 13px;
    line-height: 1.75;
    color: var(--text-secondary);
    scrollbar-width: thin;
    scrollbar-color: var(--bg-hover) transparent;
}

.terms-content::-webkit-scrollbar {
    width: 6px;
}

.terms-content::-webkit-scrollbar-track {
    background: transparent;
}

.terms-content::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: 3px;
}

.terms-content h3 {
    color: var(--gold);
    font-size: 15px;
    font-weight: 700;
    margin-top: 20px;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.terms-content h3:first-child {
    margin-top: 0;
}

.terms-content p {
    margin-bottom: 10px;
}

.terms-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.terms-content ul {
    padding-left: 20px;
    margin-bottom: 12px;
}

.terms-content li {
    margin-bottom: 6px;
}

.terms-footer {
    padding: 16px 32px 24px;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.terms-accept-label {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--text-tertiary);
    cursor: not-allowed;
    user-select: none;
    transition: color var(--transition);
}

.terms-accept-label.enabled {
    color: var(--text-primary);
    cursor: pointer;
}

.terms-accept-label input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 6px;
    background: var(--bg-tertiary);
    cursor: inherit;
    position: relative;
    transition: all var(--transition);
    flex-shrink: 0;
}

.terms-accept-label input[type="checkbox"]:not(:disabled):hover {
    border-color: var(--gold);
}

.terms-accept-label input[type="checkbox"]:checked {
    background: var(--gold);
    border-color: var(--gold);
}

.terms-accept-label input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 5.5px;
    top: 2px;
    width: 6px;
    height: 10px;
    border: solid var(--bg-primary);
    border-width: 0 2.5px 2.5px 0;
    transform: rotate(45deg);
}

.terms-btn {
    width: 100%;
    padding: 14px 24px;
    border-radius: var(--radius-md);
    border: none;
    font-family: inherit;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    background: var(--bg-tertiary);
    color: var(--text-tertiary);
    letter-spacing: 0.02em;
}

.terms-btn:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

.terms-btn:not(:disabled) {
    background: linear-gradient(135deg, var(--gold), var(--orange));
    color: var(--bg-primary);
    box-shadow: 0 0 20px rgba(253, 185, 19, 0.2);
}

.terms-btn:not(:disabled):hover {
    box-shadow: 0 0 30px rgba(253, 185, 19, 0.35);
    transform: translateY(-1px);
}

.terms-scroll-hint {
    font-size: 11px;
    color: var(--text-tertiary);
    animation: pulse 2s ease-in-out infinite;
}

.terms-scroll-hint.hidden {
    display: none;
}

/* ─── Onboarding Modal ──────────────────────────────────── */

.onboarding-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    animation: overlayIn 400ms ease both;
}

.onboarding-overlay.hidden {
    display: none;
}

@keyframes overlayIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.onboarding-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    max-width: 480px;
    width: 100%;
    padding: 40px 36px 28px;
    box-shadow: var(--shadow-lg), 0 0 60px rgba(253, 185, 19, 0.06);
    animation: modalIn 500ms cubic-bezier(0.16, 1, 0.3, 1) both;
    position: relative;
    overflow: hidden;
}

.onboarding-modal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--gold), var(--orange), transparent);
}

@keyframes modalIn {
    from { opacity: 0; transform: translateY(24px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.onboarding-slides {
    position: relative;
    min-height: 220px;
}

.onboarding-slide {
    display: none;
    text-align: center;
    animation: slideIn 400ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.onboarding-slide.active {
    display: block;
}

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

.slide-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle, var(--gold-dim), transparent);
    border-radius: 20px;
    color: var(--gold);
}

.slide-icon svg {
    stroke: var(--gold);
}

.onboarding-slide h2 {
    font-size: 22px;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--text-primary), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.onboarding-slide p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.onboarding-slide p strong {
    color: var(--gold);
    font-weight: 600;
}

.onboarding-dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 24px 0 20px;
}

.onboarding-dots .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--bg-hover);
    cursor: pointer;
    transition: all var(--transition);
}

.onboarding-dots .dot.active {
    background: var(--gold);
    box-shadow: 0 0 8px rgba(253, 185, 19, 0.4);
    width: 24px;
    border-radius: 4px;
}

.onboarding-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 4px;
}

.onboarding-dismiss {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-tertiary);
    cursor: pointer;
    user-select: none;
}

.onboarding-dismiss input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--bg-tertiary);
    cursor: pointer;
    position: relative;
    transition: all var(--transition);
}

.onboarding-dismiss input[type="checkbox"]:checked {
    background: var(--gold);
    border-color: var(--gold);
}

.onboarding-dismiss input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 4.5px;
    top: 1.5px;
    width: 5px;
    height: 9px;
    border: solid var(--bg-primary);
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.onboarding-btns {
    display: flex;
    gap: 8px;
}

.onboarding-btn {
    padding: 8px 20px;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    border: none;
}

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

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

.onboarding-btn.primary {
    background: linear-gradient(135deg, var(--gold), var(--orange));
    color: var(--bg-primary);
    box-shadow: 0 0 16px rgba(253, 185, 19, 0.2);
}

.onboarding-btn.primary:hover {
    box-shadow: 0 0 24px rgba(253, 185, 19, 0.35);
    transform: translateY(-1px);
}

/* ─── Status dot glow animation ─────────────────────────── */

.status-dot.online {
    background: var(--success);
    box-shadow: 0 0 8px rgba(52, 199, 89, 0.5);
    animation: statusGlow 2s ease-in-out infinite;
}

@keyframes statusGlow {
    0%, 100% { box-shadow: 0 0 6px rgba(52, 199, 89, 0.4); }
    50% { box-shadow: 0 0 12px rgba(52, 199, 89, 0.7); }
}

/* ─── User message glass effect ─────────────────────────── */

.message.user .message-content {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-elevated));
    border: 1px solid rgba(255, 255, 255, 0.06);
}