:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2d2d2d;
    --bg-quaternary: #404040;
    --bg-hover: #3a3a3a;
    --bg-active: #4a4a4a;
    --bg-modal: #1a1a1a;
    --bg-card: #1a1a1a;
    --bg-surface: #1a1a1a;
    --bg-message-in: #252525;
    --bg-message-out: #527c9e;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #808080;
    --text-placeholder: #666666;
    --accent: #527c9e;
    --accent-hover: #6a9ab5;
    --accent-light: rgba(82, 124, 158, 0.2);
    --danger: #e17055;
    --danger-hover: #d55a40;
    --danger-light: rgba(225, 112, 85, 0.2);
    --success: #00b894;
    --success-hover: #00a884;
    --success-light: rgba(0, 184, 148, 0.2);
    --warning: #fdcb6e;
    --warning-light: rgba(253, 203, 110, 0.2);
    --gold: #fbbf24;
    --gold-hover: #f59e0b;
    --gold-light: rgba(251, 191, 36, 0.2);
    --info: #74b9ff;
    --info-light: rgba(116, 185, 255, 0.2);
    --border-color: #3a3a3a;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.4);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.5);
    --shadow-xl: 0 8px 32px rgba(0,0,0,0.6);
    --transition-fast: 0.1s ease;
    --transition: 0.15s ease;
    --transition-slow: 0.3s ease;
    --sidebar-width: 315px;
    --sidebar-min-width: 200px;
    --sidebar-max-width: 500px;
    --info-width: 288px;
    --header-height: 54px;
    --message-max-width: 65%;
    --border-radius-sm: 7px;
    --border-radius: 11px;
    --border-radius-lg: 18px;
    --border-radius-xl: 25px;
    --border-radius-full: 50%;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Courier New', monospace;
    --z-fab: 25;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-sidebar: 500;
    --z-modal: 1000;
    --z-popover: 1100;
    --z-toast: 1200;
    --z-context-menu: 10000;
    --z-media-viewer: 20000;
    --wallpaper-opacity: 0.15;
    --profile-header-bg: #1a1a2e;
    --interface-scale: 1;
    --text-scale: 1;
}

[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e8e8e8;
    --bg-quaternary: #d4d4d4;
    --bg-hover: #e0e0e0;
    --bg-active: #cccccc;
    --bg-modal: #ffffff;
    --bg-card: #f8f8f8;
    --bg-surface: #ffffff;
    --bg-message-in: #e8e8e8;
    --bg-message-out: #4a90d9;
    --text-primary: #1a1a1a;
    --text-secondary: #555555;
    --text-muted: #888888;
    --text-placeholder: #aaaaaa;
    --accent: #4a90d9;
    --accent-hover: #3570b0;
    --accent-light: rgba(74,144,217,0.1);
    --danger: #e15554;
    --danger-hover: #c94040;
    --success: #00a884;
    --warning: #e6a020;
    --gold: #d4a017;
    --border-color: #dddddd;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.15);
    --shadow-xl: 0 8px 32px rgba(0,0,0,0.2);
    --wallpaper-opacity: 0.5;
    --profile-header-bg: #f0f0f5;
}

[data-theme="amoled"] {
    --bg-primary: #000000;
    --bg-secondary: #050505;
    --bg-tertiary: #0a0a0a;
    --bg-quaternary: #151515;
    --bg-hover: #151515;
    --bg-active: #1a1a1a;
    --bg-modal: #050505;
    --bg-card: #050505;
    --bg-surface: #050505;
    --bg-message-in: #111111;
    --bg-message-out: #527c9e;
    --text-primary: #ffffff;
    --text-secondary: #999999;
    --text-muted: #666666;
    --text-placeholder: #555555;
    --accent: #527c9e;
    --accent-hover: #6a9ab5;
    --accent-light: rgba(82,124,158,0.15);
    --danger: #e17055;
    --danger-hover: #d55a40;
    --danger-light: rgba(225,112,85,0.15);
    --success: #00b894;
    --success-hover: #00a884;
    --success-light: rgba(0,184,148,0.15);
    --warning: #fdcb6e;
    --warning-light: rgba(253,203,110,0.15);
    --gold: #fbbf24;
    --gold-hover: #f59e0b;
    --gold-light: rgba(251,191,36,0.15);
    --info: #74b9ff;
    --info-light: rgba(116,185,255,0.15);
    --border-color: #111111;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.5);
    --shadow-md: 0 2px 8px rgba(0,0,0,0.6);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.7);
    --shadow-xl: 0 8px 32px rgba(0,0,0,0.8);
    --wallpaper-opacity: 0.1;
    --profile-header-bg: #000000;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; -webkit-tap-highlight-color: transparent; height: 100%; overflow: hidden; }

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.45;
    user-select: none;
    -webkit-user-select: none;
    max-width: 100vw;
    overflow-x: hidden;
    font-size: calc(15px * var(--interface-scale, 1));
}

h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.2; color: var(--text-primary); }
h1 { font-size: calc(29px * var(--text-scale, 1)); }
h2 { font-size: calc(25px * var(--text-scale, 1)); }
h3 { font-size: calc(18px * var(--text-scale, 1)); }
h4 { font-size: calc(14px * var(--text-scale, 1)); }
p { margin-bottom: 7px; color: var(--text-secondary); font-size: calc(14px * var(--text-scale, 1)); }
small { font-size: calc(11px * var(--text-scale, 1)); color: var(--text-muted); }

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { text-decoration: underline; color: var(--accent-hover); }

kbd {
    background: var(--bg-tertiary);
    padding: 2px 7px;
    border-radius: 4px;
    font-size: calc(12px * var(--text-scale, 1));
    font-family: var(--font-mono);
    border: 1px solid var(--border-color);
}

code {
    background: var(--bg-tertiary);
    padding: 2px 5px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    transition: var(--transition);
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
    color: var(--text-primary);
    position: relative;
    z-index: 1;
    font-size: calc(14px * var(--text-scale, 1));
}

button:disabled { opacity: 0.5; cursor: not-allowed; pointer-events: none; }

::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }
::selection { background: var(--accent); color: white; }

body.modal-open { overflow: hidden; }
body.message-select-mode .message { cursor: pointer; }
.energy-saving .message-animated-emoji { display: none; }

*:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }