/* ========================================
   CSS Variables - Purple Glass-Morphism Theme
   Luxurious, atmospheric dark purple aesthetic
   ======================================== */

@import url('https://fonts.googleapis.com/css2?family=SF+Pro+Display:wght@400;500;600&display=swap');

:root {
    /* Core Purple Palette */
    --purple-deep: #0a0612;
    --purple-dark: #1a0a2e;
    --purple-mid: #2d1b4e;
    --purple-rich: #4a1f7a;
    --purple-vibrant: #9b30ff;
    --purple-bright: #bf40ff;
    --purple-glow: #d060ff;
    --magenta-accent: #e040fb;

    /* Background Colors */
    --bg-primary: #080410;
    --bg-secondary: rgba(26, 10, 46, 0.85);
    --bg-tertiary: rgba(45, 27, 78, 0.6);
    --bg-glass: rgba(45, 27, 78, 0.35);
    --bg-glass-strong: rgba(60, 35, 100, 0.5);

    /* Message Backgrounds */
    --bg-message-npc: rgba(40, 25, 65, 0.75);
    --bg-message-player: linear-gradient(135deg, #9b30ff 0%, #bf40ff 50%, #d060ff 100%);
    --bg-message-player-solid: #b040ff;

    /* Sidebar */
    --bg-sidebar: rgba(15, 8, 30, 0.95);
    --bg-modal: rgba(8, 4, 16, 0.92);

    /* Choice Buttons */
    --bg-choice: rgba(100, 60, 150, 0.25);
    --bg-choice-hover: rgba(130, 80, 180, 0.4);

    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: rgba(200, 180, 220, 0.8);
    --text-tertiary: rgba(160, 140, 180, 0.6);
    --text-timestamp: rgba(180, 160, 200, 0.7);
    --text-on-player: #ffffff;
    --text-placeholder: rgba(180, 150, 210, 0.5);

    /* Accent Colors */
    --accent-purple: #b040ff;
    --accent-pink: #e040fb;
    --accent-red: #ff4060;
    --accent-green: #40d080;

    /* Borders & Effects */
    --border-color: rgba(150, 100, 200, 0.2);
    --border-glow: rgba(180, 100, 255, 0.3);
    --glow-purple: 0 0 60px rgba(155, 48, 255, 0.3);
    --glow-message: 0 4px 20px rgba(155, 48, 255, 0.2);

    /* Border Radii */
    --border-radius-sm: 12px;
    --border-radius-md: 20px;
    --border-radius-lg: 24px;
    --border-radius-xl: 32px;
    --border-radius-full: 9999px;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Typography */
    --font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 17px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --line-height: 1.45;
    --letter-spacing: 0.01em;

    /* Sizes */
    --header-height: 64px;
    --sidebar-width: 320px;
    --avatar-size: 36px;
    --choice-min-height: 48px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(155, 48, 255, 0.15);

    /* Backdrop Blur */
    --blur-sm: 8px;
    --blur-md: 16px;
    --blur-lg: 24px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Safe Areas */
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
}

/* ========================================
   Low Contrast Theme (Privacy Mode)
   Dark gray tones for privacy
   ======================================== */
[data-theme="low-contrast"] {
    /* Neutral gray palette */
    --purple-deep: #0a0a0a;
    --purple-dark: #111111;
    --purple-mid: #181818;
    --purple-rich: #222222;
    --purple-vibrant: #333333;
    --purple-bright: #3a3a3a;
    --purple-glow: #444444;
    --magenta-accent: #4a4a4a;

    /* Background Colors - dark gray */
    --bg-primary: #080808;
    --bg-secondary: rgba(17, 17, 17, 0.95);
    --bg-tertiary: rgba(24, 24, 24, 0.7);
    --bg-glass: rgba(24, 24, 24, 0.5);
    --bg-glass-strong: rgba(34, 34, 34, 0.6);

    /* Message Backgrounds - subtle gray */
    --bg-message-npc: rgba(22, 22, 22, 0.9);
    --bg-message-player: linear-gradient(135deg, #2a2a2a 0%, #333333 50%, #3a3a3a 100%);
    --bg-message-player-solid: #303030;

    /* Sidebar */
    --bg-sidebar: rgba(12, 12, 12, 0.98);
    --bg-modal: rgba(8, 8, 8, 0.95);

    /* Choice Buttons - subtle */
    --bg-choice: rgba(40, 40, 40, 0.3);
    --bg-choice-hover: rgba(50, 50, 50, 0.5);

    /* Text Colors - low contrast gray */
    --text-primary: rgba(160, 160, 160, 0.85);
    --text-secondary: rgba(120, 120, 120, 0.7);
    --text-tertiary: rgba(90, 90, 90, 0.5);
    --text-timestamp: rgba(100, 100, 100, 0.6);
    --text-on-player: rgba(170, 170, 170, 0.9);
    --text-placeholder: rgba(80, 80, 80, 0.5);

    /* Accent Colors - muted gray */
    --accent-purple: #505050;
    --accent-pink: #555555;
    --accent-red: #4a3535;
    --accent-green: #354a35;

    /* Borders & Effects - very subtle */
    --border-color: rgba(60, 60, 60, 0.2);
    --border-glow: rgba(70, 70, 70, 0.15);
    --glow-purple: 0 0 30px rgba(40, 40, 40, 0.1);
    --glow-message: 0 2px 8px rgba(0, 0, 0, 0.15);

    /* Shadows - minimal */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 3px 10px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 6px 20px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 15px rgba(40, 40, 40, 0.05);
}

/* Remove glow effects in low contrast mode */
[data-theme="low-contrast"] .chat::after {
    background: radial-gradient(circle, rgba(30, 30, 30, 0.05) 0%, transparent 70%);
}

[data-theme="low-contrast"] .chat::before {
    background: linear-gradient(180deg, #0a0a0a 0%, #111111 40%, #181818 100%);
}

/* Choices panel - remove purple glow */
[data-theme="low-contrast"] .chat__choices::before {
    background: linear-gradient(180deg,
        transparent 0%,
        rgba(10, 10, 10, 0.7) 15%,
        rgba(10, 10, 10, 0.95) 40%,
        rgba(10, 10, 10, 1) 60%);
}

[data-theme="low-contrast"] .chat__choices::after {
    background: radial-gradient(ellipse, rgba(30, 30, 30, 0.1) 0%, transparent 70%);
}

/* Sidebar overlay - neutral */
[data-theme="low-contrast"] .sidebar-overlay {
    background: rgba(5, 5, 5, 0.8);
}

/* ========================================
   Reset & Base Styles
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: var(--line-height);
    letter-spacing: var(--letter-spacing);
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow: hidden;
    height: 100vh;
    height: 100dvh;
}

button {
    font-family: inherit;
    font-size: inherit;
    border: none;
    background: none;
    cursor: pointer;
    color: inherit;
    -webkit-tap-highlight-color: transparent;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    -webkit-tap-highlight-color: transparent;
}

/* ========================================
   Sidebar
   ======================================== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    max-width: 85vw;
    height: 100%;
    background: var(--bg-sidebar);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    z-index: 100;
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    padding-top: var(--safe-area-top);
    padding-left: var(--safe-area-left);
    border-right: 1px solid var(--border-color);
}

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

.sidebar__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    min-height: var(--header-height);
}

.sidebar__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--purple-glow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar__close {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border-radius: var(--border-radius-full);
    transition: all var(--transition-fast);
}

.sidebar__close:hover {
    background: var(--bg-glass);
    color: var(--text-primary);
}

.sidebar__list {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-sm) 0;
}

.sidebar__item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    gap: var(--spacing-md);
    border-left: 3px solid transparent;
}

.sidebar__item:hover {
    background: var(--bg-glass);
    border-left-color: var(--accent-purple);
}

.sidebar__item.is-active {
    background: var(--bg-glass-strong);
    border-left-color: var(--accent-purple);
}

.sidebar__item-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-md);
    background: linear-gradient(135deg, var(--purple-rich) 0%, var(--purple-vibrant) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    flex-shrink: 0;
    box-shadow: var(--glow-message);
}

.sidebar__item-info {
    flex: 1;
    min-width: 0;
}

.sidebar__item-title {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar__item-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar__item-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.sidebar__item-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

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

.sidebar__item-btn--delete:hover {
    color: var(--accent-red);
}

.sidebar__actions {
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.sidebar__btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    color: var(--accent-purple);
    transition: all var(--transition-fast);
}

.sidebar__btn:hover {
    background: var(--bg-glass);
}

.sidebar__footer {
    padding: var(--spacing-md);
    padding-bottom: calc(var(--spacing-md) + var(--safe-area-bottom));
    border-top: 1px solid var(--border-color);
}

.sidebar__btn--settings {
    color: var(--text-secondary);
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(8, 4, 16, 0.7);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.sidebar-overlay.is-visible {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   Chat Container
   ======================================== */
.chat {
    display: flex;
    flex-direction: column;
    height: 100%;
    height: 100dvh;
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

/* Atmospheric gradient background */
.chat::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% 100%, rgba(155, 48, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 70% 80%, rgba(180, 64, 255, 0.1) 0%, transparent 40%),
        radial-gradient(ellipse 50% 30% at 30% 70%, rgba(140, 40, 200, 0.08) 0%, transparent 35%),
        linear-gradient(180deg, var(--purple-deep) 0%, var(--purple-dark) 40%, var(--purple-mid) 100%);
    pointer-events: none;
    z-index: 0;
}

/* Animated glow orb */
.chat::after {
    content: '';
    position: absolute;
    bottom: 15%;
    left: 50%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(155, 48, 255, 0.2) 0%, transparent 70%);
    transform: translateX(-50%);
    filter: blur(60px);
    pointer-events: none;
    z-index: 0;
    animation: glowPulse 8s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { opacity: 0.5; transform: translateX(-50%) scale(1); }
    50% { opacity: 0.8; transform: translateX(-50%) scale(1.1); }
}

.chat__header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    padding-top: calc(var(--spacing-sm) + var(--safe-area-top));
    background: var(--bg-secondary);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border-bottom: 1px solid var(--border-color);
    min-height: calc(var(--header-height) + var(--safe-area-top));
    position: relative;
    z-index: 10;
}

.chat__menu-btn,
.chat__restart-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-purple);
    border-radius: var(--border-radius-full);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.chat__menu-btn:hover,
.chat__restart-btn:hover {
    background: var(--bg-glass);
    box-shadow: var(--shadow-glow);
}

.chat__header-info {
    flex: 1;
    min-width: 0;
    text-align: center;
}

.chat__title {
    font-size: var(--font-size-md);
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat__subtitle {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
}

/* ========================================
   Messages
   ======================================== */
.chat__messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    padding-bottom: calc(160px + var(--safe-area-bottom));
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    position: relative;
    z-index: 1;
    scroll-behavior: smooth;
}

.message {
    display: flex;
    gap: var(--spacing-sm);
    max-width: 80%;
    animation: messageAppear 0.4s var(--transition-bounce) both;
}

@keyframes messageAppear {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.message--npc {
    align-self: flex-start;
}

.message--player {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message__avatar {
    width: var(--avatar-size);
    height: var(--avatar-size);
    border-radius: var(--border-radius-full);
    background: var(--bg-glass-strong);
    flex-shrink: 0;
    overflow: hidden;
    align-self: flex-end;
    box-shadow: var(--shadow-sm);
}

.message__avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.message__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.message--player .message__content {
    align-items: flex-end;
}

.message__name {
    font-size: var(--font-size-xs);
    font-weight: 500;
    padding: 0 var(--spacing-sm);
}

.message--npc .message__name {
    color: var(--accent-purple);
}

.message--player .message__name {
    color: var(--accent-pink);
}

.message__bubble {
    padding: 10px 16px;
    border-radius: var(--border-radius-lg);
    word-wrap: break-word;
    white-space: pre-wrap;
    font-size: var(--font-size-md);
    line-height: 1.5;
}

.message--npc .message__bubble {
    background: var(--bg-message-npc);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: var(--spacing-xs);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    box-shadow: var(--shadow-sm);
}

.message--player .message__bubble {
    background: var(--bg-message-player);
    color: var(--text-on-player);
    border-bottom-right-radius: var(--spacing-xs);
    box-shadow: var(--glow-message), var(--shadow-md);
}

/* Message timestamp */
.message__meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0 var(--spacing-sm);
    margin-top: var(--spacing-xs);
}

.message--player .message__meta {
    justify-content: flex-end;
}

.message__timestamp {
    font-size: var(--font-size-xs);
    color: var(--text-timestamp);
}

.message__status {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--text-timestamp);
}

.message__status-icon {
    width: 14px;
    height: 14px;
    animation: spin 1s linear infinite;
}

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

/* Continuation messages */
.message--continuation {
    margin-top: calc(var(--spacing-xs) * -1);
}

.message--continuation .message__avatar {
    visibility: hidden;
}

.message--npc.message--continuation .message__bubble {
    border-top-left-radius: var(--spacing-xs);
}

.message--player.message--continuation .message__bubble {
    border-top-right-radius: var(--spacing-xs);
}

/* ========================================
   Typing Indicator
   ======================================== */
.typing-indicator {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    animation: messageAppear 0.3s ease both;
    pointer-events: none;
    z-index: 5;
}

.typing-indicator[hidden] {
    display: none;
}

.typing-indicator__avatar {
    width: var(--avatar-size);
    height: var(--avatar-size);
    border-radius: var(--border-radius-full);
    background: var(--bg-glass-strong);
    flex-shrink: 0;
    overflow: hidden;
}

.typing-indicator__avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.typing-indicator__bubble {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-message-npc);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    border-bottom-left-radius: var(--spacing-xs);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
}

.typing-indicator__dot {
    width: 8px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: typingDot 1.4s infinite;
}

.typing-indicator__dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator__dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingDot {
    0%, 60%, 100% {
        opacity: 0.3;
        transform: scale(0.8) translateY(0);
    }
    30% {
        opacity: 1;
        transform: scale(1) translateY(-4px);
    }
}

/* ========================================
   Choices Panel
   ======================================== */
.chat__choices {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    padding-top: var(--spacing-xl);
    padding-bottom: calc(var(--spacing-lg) + var(--safe-area-bottom));
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: 20;
}

.chat__choices::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg,
        transparent 0%,
        rgba(10, 6, 18, 0.7) 15%,
        rgba(10, 6, 18, 0.95) 40%,
        rgba(10, 6, 18, 1) 60%);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    mask-image: linear-gradient(180deg, transparent 0%, black 30%);
    -webkit-mask-image: linear-gradient(180deg, transparent 0%, black 30%);
    pointer-events: none;
}

.chat__choices::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 300px;
    height: 150px;
    background: radial-gradient(ellipse, rgba(155, 48, 255, 0.2) 0%, transparent 70%);
    filter: blur(40px);
    pointer-events: none;
}

.chat__choices:empty {
    display: none;
}

.choice-btn {
    width: 100%;
    min-height: var(--choice-min-height);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-choice);
    color: var(--text-primary);
    border-radius: var(--border-radius-lg);
    text-align: left;
    transition: all var(--transition-fast);
    animation: choiceAppear 0.4s var(--transition-bounce);
    animation-fill-mode: both;
    border: 1px solid var(--border-color);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    position: relative;
    z-index: 1;
    font-size: var(--font-size-md);
}

.choice-btn:nth-child(1) { animation-delay: 0ms; }
.choice-btn:nth-child(2) { animation-delay: 50ms; }
.choice-btn:nth-child(3) { animation-delay: 100ms; }
.choice-btn:nth-child(4) { animation-delay: 150ms; }

@keyframes choiceAppear {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.choice-btn:hover {
    background: var(--bg-choice-hover);
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.choice-btn:active {
    transform: scale(0.98);
    background: linear-gradient(135deg, var(--purple-vibrant) 0%, var(--purple-bright) 100%);
    border-color: var(--purple-glow);
}

/* ========================================
   Empty State
   ======================================== */
.chat__empty {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-align: center;
    padding: var(--spacing-xl);
    position: relative;
    z-index: 1;
}

.chat__empty[hidden] {
    display: none;
}

/* ========================================
   Modals
   ======================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-modal);
    backdrop-filter: blur(var(--blur-md));
    -webkit-backdrop-filter: blur(var(--blur-md));
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    animation: modalAppear 0.3s ease both;
}

.modal[hidden] {
    display: none;
}

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

.modal__content {
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    background: var(--bg-secondary);
    backdrop-filter: blur(var(--blur-lg));
    -webkit-backdrop-filter: blur(var(--blur-lg));
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    display: flex;
    flex-direction: column;
    animation: modalSlide 0.4s var(--transition-bounce) both;
    box-shadow: var(--shadow-lg), var(--glow-purple);
}

@keyframes modalSlide {
    from {
        transform: translateY(40px) scale(0.95);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.modal__content--small {
    max-width: 400px;
}

.modal__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.modal__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--purple-glow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    flex: 1;
}

.modal__header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.modal__icon-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.modal__icon-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--bg-glass);
    opacity: 0;
    transition: opacity var(--transition-fast);
    border-radius: var(--border-radius-sm);
}

.modal__icon-btn:hover::before {
    opacity: 1;
}

.modal__icon-btn:hover {
    color: var(--accent-purple);
    transform: translateY(-1px);
}

.modal__icon-btn:active {
    transform: translateY(0) scale(0.95);
}

.modal__icon-btn svg {
    position: relative;
    z-index: 1;
}

.modal__close {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border-radius: var(--border-radius-full);
    transition: all var(--transition-fast);
}

.modal__close:hover {
    background: var(--bg-glass);
    color: var(--text-primary);
}

.modal__body {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.modal__textarea {
    width: 100%;
    min-height: 300px;
    padding: var(--spacing-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    resize: vertical;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: var(--font-size-sm);
    line-height: 1.6;
    transition: all var(--transition-fast);
}

.modal__textarea:focus {
    outline: none;
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

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

.modal__error {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(255, 64, 96, 0.1);
    border: 1px solid var(--accent-red);
    border-radius: var(--border-radius-sm);
    color: var(--accent-red);
    font-size: var(--font-size-sm);
}

.modal__error[hidden] {
    display: none;
}

.modal__footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.modal__footer--spread {
    justify-content: space-between;
}

.modal__footer--vertical {
    flex-direction: column;
    gap: var(--spacing-sm);
}

.modal__footer-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.modal__footer-actions--full {
    width: 100%;
}

.modal__footer-actions--full .modal__btn {
    flex: 1;
}

.modal__btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.modal__btn svg {
    flex-shrink: 0;
}

.modal__btn--primary {
    background: linear-gradient(135deg, var(--purple-vibrant) 0%, var(--purple-bright) 100%);
    color: var(--text-on-player);
    box-shadow: var(--glow-message);
}

.modal__btn--primary:hover {
    box-shadow: var(--glow-message), var(--shadow-glow);
    transform: translateY(-1px);
}

.modal__btn--secondary {
    background: var(--bg-glass-strong);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.modal__btn--secondary:hover {
    background: var(--bg-choice-hover);
    border-color: var(--border-glow);
}

.modal__btn--danger {
    background: var(--accent-red);
    color: var(--text-on-player);
}

.modal__btn--danger:hover {
    box-shadow: 0 0 20px rgba(255, 64, 96, 0.3);
}

.modal__btn--ghost {
    background: transparent;
    color: var(--text-secondary);
}

.modal__btn--ghost:hover {
    color: var(--accent-purple);
    background: var(--bg-glass);
}

/* ========================================
   Settings
   ======================================== */
.settings-item {
    margin-bottom: var(--spacing-lg);
}

.settings-item:last-child {
    margin-bottom: 0;
}

.settings-item__label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

.settings-item__select {
    width: 100%;
    padding: var(--spacing-md);
    padding-right: calc(var(--spacing-md) + 24px);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23a0a0b0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

.settings-item__select:focus {
    outline: none;
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.settings-item__btn {
    width: 100%;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.settings-item__btn--danger {
    background: transparent;
    border: 1px solid var(--accent-red);
    color: var(--accent-red);
}

.settings-item__btn--danger:hover {
    background: var(--accent-red);
    color: var(--text-on-player);
}

.settings-item__group {
    display: flex;
    gap: 12px;
}

.settings-item__field {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.settings-item__field-label {
    font-size: 13px;
    color: var(--text-secondary);
}

.settings-item__input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-glass);
    border: 1px solid rgba(155, 48, 255, 0.2);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 15px;
    transition: all 0.2s;
}

.settings-item__input:focus {
    outline: none;
    border-color: var(--purple-vibrant);
    background: var(--bg-glass-strong);
}

/* ========================================
   Theme Selector (Segmented Control)
   ======================================== */
.theme-selector {
    display: flex;
    gap: var(--spacing-sm);
    padding: 4px;
    background: rgba(20, 10, 40, 0.6);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(var(--blur-sm));
}

.theme-selector__input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.theme-selector__option {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 12px 16px;
    border-radius: 10px;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.theme-selector__option::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--purple-vibrant), var(--purple-bright));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.theme-selector__input:checked + .theme-selector__option::before {
    opacity: 1;
}

.theme-selector__option:hover::before {
    opacity: 0.5;
}

.theme-selector__input:checked + .theme-selector__option:hover::before {
    opacity: 1;
}

.theme-selector__icon,
.theme-selector__label {
    position: relative;
    z-index: 1;
}

.theme-selector__icon {
    display: flex;
    align-items: center;
    color: var(--text-secondary);
    transition: color var(--transition-normal);
}

.theme-selector__input:checked + .theme-selector__option .theme-selector__icon {
    color: var(--text-on-player);
}

.theme-selector__label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition-normal);
}

.theme-selector__input:checked + .theme-selector__option .theme-selector__label {
    color: var(--text-on-player);
}

/* ========================================
   Slider Control (Custom Range)
   ======================================== */
.slider-control {
    margin-top: var(--spacing-md);
    padding: 0 2px;
}

.slider-control:first-of-type {
    margin-top: 0;
}

.slider-control__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.slider-control__label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.slider-control__value {
    font-size: 15px;
    font-weight: 600;
    color: var(--purple-bright);
    font-variant-numeric: tabular-nums;
    min-width: 52px;
    text-align: right;
}

.slider-control__input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.slider-control__track {
    position: relative;
    height: 8px;
    background: rgba(20, 10, 40, 0.6);
    border-radius: var(--border-radius-full);
    border: 1px solid var(--border-color);
    cursor: pointer;
    margin: 10px 0;
}

.slider-control__track::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: var(--border-radius-full);
    overflow: hidden;
    pointer-events: none;
}

.slider-control__fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--purple-vibrant), var(--purple-bright));
    transition: width var(--transition-fast);
    box-shadow: 0 0 20px rgba(155, 48, 255, 0.4);
    pointer-events: none;
    border-radius: var(--border-radius-full) 0 0 var(--border-radius-full);
}

.slider-control__fill::after {
    content: '';
    position: absolute;
    right: -10px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, var(--purple-bright), var(--purple-glow));
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.3);
    box-shadow:
        0 2px 12px rgba(155, 48, 255, 0.6),
        inset 0 1px 3px rgba(255, 255, 255, 0.3);
    cursor: grab;
    transition: all var(--transition-fast);
    pointer-events: auto;
    z-index: 10;
}

.slider-control__track:hover .slider-control__fill::after {
    transform: translateY(-50%) scale(1.15);
    box-shadow:
        0 4px 16px rgba(155, 48, 255, 0.8),
        inset 0 1px 3px rgba(255, 255, 255, 0.3);
}

.slider-control__track:active .slider-control__fill::after {
    cursor: grabbing;
    transform: translateY(-50%) scale(1.05);
}

/* ========================================
   Language Selector (Custom Dropdown)
   ======================================== */
.language-selector {
    position: relative;
}

.language-selector__select {
    width: 100%;
    padding: 14px 48px 14px 16px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

.language-selector__select:hover {
    background: var(--bg-glass-strong);
    border-color: var(--border-glow);
}

.language-selector__select:focus {
    outline: none;
    border-color: var(--purple-vibrant);
    box-shadow:
        0 0 0 3px rgba(155, 48, 255, 0.15),
        var(--shadow-glow);
}

.language-selector__icon {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    pointer-events: none;
    transition: all var(--transition-normal);
}

.language-selector__select:focus ~ .language-selector__icon {
    color: var(--purple-bright);
    transform: translateY(-50%) rotate(180deg);
}

/* ========================================
   Scrollbar Styling
   ======================================== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--bg-glass-strong);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-glow);
}

/* ========================================
   Utility Classes
   ======================================== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ========================================
   Media Queries
   ======================================== */
@media (min-width: 768px) {
    .sidebar {
        width: var(--sidebar-width);
    }

    .message {
        max-width: 60%;
    }

    .chat__choices {
        left: 0;
        transform: none;
    }

    .chat__choices .choice-btn {
        max-width: 600px;
        margin-left: auto;
        margin-right: auto;
    }
}

@media (min-width: 1024px) {
    .modal__textarea {
        min-height: 400px;
    }
}

/* ========================================
   Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}