/* ========================================================
   ChemHub — Shared Design System
   Used by: index.html, tools/viewer/, tools/adme/, tools/docking/
   ======================================================== */

/* ── CSS Custom Properties — Dark Theme (default) ── */
:root {
    /* Backgrounds */
    --bg-deep:    #06060e;
    --bg-mid:     #0c0c1e;
    --bg-surface: rgba(16, 16, 36, 0.65);

    /* Glass cards */
    --glass-border: rgba(120, 200, 255, 0.10);
    --glass-bg:     rgba(18, 18, 44, 0.55);
    --glass-hover:  rgba(24, 24, 56, 0.7);

    /* Shadows */
    --shadow-card:   0 4px 30px rgba(0, 0, 0, 0.4);
    --shadow-header: 0 1px 0 rgba(255, 255, 255, 0.04);
    --shadow-hover:  0 20px 60px rgba(0, 0, 0, 0.5);

    /* Accent colors */
    --accent:            #e91e8c;
    --accent-dim:        rgba(233, 30, 140, 0.14);
    --accent-glow:       rgba(233, 30, 140, 0.32);
    --accent-purple:     #a855f7;
    --accent-purple-dim: rgba(168, 85, 247, 0.15);
    --accent-purple-glow:rgba(168, 85, 247, 0.35);

    --accent-green:      #10b981;
    --accent-green-dim:  rgba(16, 185, 129, 0.15);
    --accent-green-glow: rgba(16, 185, 129, 0.35);

    --accent-gold:       #fbbf24;
    --accent-gold-dim:   rgba(251, 191, 36, 0.15);
    --accent-gold-glow:  rgba(251, 191, 36, 0.35);

    /* Text */
    --text-primary:   #e8ecf4;
    --text-secondary: #8892a8;
    --text-muted:     #515b70;

    /* Separators / dividers */
    --divider: rgba(255, 255, 255, 0.06);
    --surface-inset: rgba(255, 255, 255, 0.03);
    --border-subtle: rgba(255, 255, 255, 0.07);

    /* Danger */
    --danger:    #ff4d6a;
    --danger-bg: rgba(255, 77, 106, 0.12);

    /* Success */
    --success:    #00e5a0;
    --success-bg: rgba(0, 229, 160, 0.12);
    --warning:    #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.12);

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Border radii */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --duration: 0.3s;
    /* Utilities */
    --ambient-glow: rgba(0, 229, 255, 0.08);
}

/* ── Light Theme Variables ── */
:root.light-theme {
    /* Backgrounds */
    --bg-deep:    #f5f7fa;
    --bg-mid:     #e4e8f0;
    --bg-surface: rgba(230, 235, 245, 0.7);

    /* Glass cards */
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-bg:     rgba(15, 23, 42, 0.6);
    --glass-hover:  rgba(15, 23, 42, 0.75);

    /* Text */
    --text-primary:   #111827;
    --text-secondary: #4b5563;
    --text-muted:     #6b7280;

    /* Utilities */
    --ambient-glow: rgba(0, 0, 0, 0.03);
}

/* ── Light Theme Token Overrides ── */
[data-theme="light"] {
    /* Backgrounds — warm rose-white gradient base */
    --bg-deep:    #f6f8fb;
    --bg-mid:     #eef2f7;
    --bg-surface: rgba(255, 255, 255, 0.9);

    /* Glass cards — ultra-frosted warm white with depth */
    --glass-border: #e2e8f0;
    --glass-bg:     rgba(255, 255, 255, 0.88);
    --glass-hover:  #ffffff;

    /* Shadows — rich layered rose depth */
    --shadow-card:   0 2px 12px rgba(0, 0, 0, 0.07);
    --shadow-header: inset 0 1px 0 rgba(255, 255, 255, 0.90);
    --shadow-hover:  0 8px 24px rgba(15, 23, 42, 0.11);

    /* Accents — deep rose-pink */
    --accent:            #e91e8c;
    --accent-dim:        rgba(233, 30, 140, 0.11);
    --accent-glow:       rgba(233, 30, 140, 0.24);
    --accent-purple:     #7b1fa2;
    --accent-purple-dim: rgba(123, 31, 162, 0.11);
    --accent-purple-glow:rgba(123, 31, 162, 0.24);

    /* Text — rich near-black, warm rose undertone */
    --text-primary:   #111827;
    --text-secondary: #374151;
    --text-muted:     #4b5563;

    /* Separators — soft rose tints */
    --divider:       #e2e8f0;
    --surface-inset: #f8fafc;
    --border-subtle: #e2e8f0;

    /* Explicit raw color for hardcoded overrides */
    --accent-raw:        233, 30, 140;
    --purple-raw:        123, 31, 162;

    /* Status — adjusted for warm bg */
    --danger:    #c0162a;
    --danger-bg: rgba(192, 22, 42, 0.08);
    --success:    #006b45;
    --success-bg: rgba(0, 107, 69, 0.09);
    --warning:    #9a5000;
    --warning-bg: rgba(154, 80, 0, 0.09);
}

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

/* ── Smooth theme transitions ── */
.theme-transitioning,
.theme-transitioning *,
.theme-transitioning *::before,
.theme-transitioning *::after {
    transition:
        background-color 0.5s var(--ease-out),
        background       0.5s var(--ease-out),
        border-color     0.5s var(--ease-out),
        color            0.5s var(--ease-out),
        box-shadow       0.5s var(--ease-out),
        filter           0.5s var(--ease-out),
        opacity          0.5s ease !important;
}

.theme-crossfade-snapshot {
    position: fixed;
    inset: 0;
    z-index: 2147483647;
    pointer-events: none;
    overflow: hidden;
    background: var(--bg-deep);
    opacity: 1;
    transition: opacity 0.5s var(--ease-out), filter 0.5s var(--ease-out);
}

.theme-crossfade-snapshot.theme-crossfade-out {
    opacity: 0;
    filter: blur(1px);
}

@media (prefers-reduced-motion: reduce) {
    .theme-transitioning,
    .theme-transitioning *,
    .theme-transitioning *::before,
    .theme-transitioning *::after {
        transition-duration: 0.01ms !important;
    }

    .theme-crossfade-snapshot {
        display: none !important;
    }
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    transition: background-color 0.35s ease, color 0.35s ease;
}

/* Rich gradient background in light mode */
[data-theme="light"] body {
    background:
        radial-gradient(ellipse 80% 60% at 20% -10%, rgba(255, 180, 220, 0.35) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 85% 15%,  rgba(220, 140, 255, 0.20) 0%, transparent 55%),
        radial-gradient(ellipse 70% 70% at 50% 110%, rgba(255, 160, 210, 0.18) 0%, transparent 60%),
        linear-gradient(160deg, #f8fafc 0%, #f6f8fb 45%, #fdf4f8 100%);
}


/* ── Animated Background Canvas & Carbon Grid ── */
#bg-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none;
}

#bg-canvas::before {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.03; /* Extremely subtle */
    background-image: 
        radial-gradient(circle at 10px 10px, var(--accent) 1px, transparent 1px),
        linear-gradient(60deg, transparent 40%, rgba(0, 229, 255, 0.1) 45%, transparent 50%),
        linear-gradient(-60deg, transparent 40%, rgba(0, 229, 255, 0.1) 45%, transparent 50%);
    background-size: 40px 40px, 40px 40px, 40px 40px;
    z-index: -1;
}

:root.light-theme #bg-canvas::before {
    opacity: 0.05;
    background-image: 
        radial-gradient(circle at 10px 10px, #0284c7 1px, transparent 1px),
        linear-gradient(60deg, transparent 40%, rgba(2, 132, 199, 0.1) 45%, transparent 50%),
        linear-gradient(-60deg, transparent 40%, rgba(2, 132, 199, 0.1) 45%, transparent 50%);
}

/* ── App Container ── */
.app-container {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 0 24px;
    max-width: 1560px;
    margin: 0 auto;
}

/* ── Header ── */
.app-header {
    position: relative;
    padding: 28px 0 20px;
}

.header-glow {
    position: absolute;
    top: -60px; left: 50%;
    transform: translateX(-50%);
    width: 500px; height: 160px;
    background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 70%);
    opacity: 0.25;
    pointer-events: none;
    filter: blur(40px);
}
/* In light mode: larger, higher opacity, anchored to top */
[data-theme="light"] .header-glow {
    width: 700px;
    height: 220px;
    top: -80px;
    opacity: 0.55;
    filter: blur(50px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 16px;
    text-decoration: none;
    cursor: pointer;
}

.logo-link {
    text-decoration: none;
    color: inherit;
    transition: transform var(--duration) var(--ease-out);
}

.logo-link:hover {
    transform: scale(1.02);
}

.logo-icon {
    width: 48px; height: 48px;
    color: var(--accent);
    filter: drop-shadow(0 0 8px var(--accent-glow));
    animation: logoPulse 4s ease-in-out infinite;
    transition: color var(--duration) var(--ease-out), filter var(--duration) var(--ease-out);
}

:root.light-theme .logo-icon {
    filter: none;
}

@keyframes logoPulse {
    0%, 100% { filter: drop-shadow(0 0 8px var(--accent-glow)); }
    50%       { filter: drop-shadow(0 0 18px var(--accent-glow)); }
}

:root.light-theme .app-title {
    background: linear-gradient(135deg, #e91e8c 0%, #c21875 48%, #7b1fa2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-title {
    font-size: 1.6rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.app-subtitle {
    font-size: 0.82rem;
    color: var(--text-secondary);
    font-weight: 400;
    letter-spacing: 0.04em;
    margin-top: 2px;
}

.header-controls {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 10px;
    margin-left: auto;
    flex-wrap: wrap;
}

.back-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 40px;
    padding: 8px 15px;
    font-size: 0.82rem;
    font-weight: 600;
    font-family: var(--font-sans);
    color: var(--text-secondary);
    background: var(--surface-inset);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    text-decoration: none;
    transition: all var(--duration) var(--ease-out);
}
.back-link:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-dim);
    box-shadow: 0 4px 12px var(--accent-dim);
}

/* ── Glass Card ── */
.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 22px;
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    box-shadow: var(--shadow-card), inset 0 1px 0 var(--shadow-header);
    transition: border-color var(--duration) var(--ease-out),
                box-shadow var(--duration) var(--ease-out),
                background var(--duration) var(--ease-out);
}
.glass-card:hover { border-color: rgba(233, 30, 140, 0.24); }
[data-theme="light"] .glass-card {
    background: rgba(255,255,255,0.88);
    border-color: #e2e8f0;
    box-shadow: 0 2px 12px rgba(0,0,0,0.07);
}
[data-theme="light"] .glass-card:hover { border-color: rgba(233, 30, 140, 0.28); box-shadow: var(--shadow-hover); }

/* ── Card Titles ── */
.card-title {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.card-icon { font-size: 1rem; }

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 180ms ease;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    text-decoration: none;
}
.btn::after {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    width: 6rem; height: 6rem;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
    transition: transform 0.4s ease-out, opacity 0.4s ease-out;
}
.btn:active::after {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
    transition: 0s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #c21875);
    color: #fff;
    box-shadow: 0 2px 16px var(--accent-dim);
}
.btn-primary:hover {
    box-shadow: 0 4px 24px var(--accent-glow);
    transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }
.btn-primary.loading .btn-text { opacity: 0; }
.btn-primary.loading .btn-loader { display: block; }

/* Tool identity exceptions: these are retained only where color is part of a tool's
   domain cue, while general primary CTAs use the magenta brand button above. */

.btn-primary-purple {
    background: linear-gradient(135deg, var(--accent), #c21875);
    color: #fff;
    box-shadow: 0 2px 16px var(--accent-dim);
}
.btn-primary-purple:hover {
    box-shadow: 0 4px 24px var(--accent-glow);
    transform: translateY(-1px);
}

.btn-primary-green {
    background: linear-gradient(135deg, var(--accent), #c21875);
    color: #fff;
    box-shadow: 0 2px 16px var(--accent-dim);
}
.btn-primary-green:hover {
    box-shadow: 0 4px 24px var(--accent-glow);
    transform: translateY(-1px);
}

.btn-loader {
    display: none;
    width: 18px; height: 18px;
    border: 2.5px solid rgba(10,10,26,0.25);
    border-top-color: #0a0a1a;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    position: absolute;
}

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

.btn-ghost {
    background: var(--surface-inset);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: 8px 14px;
}
.btn-ghost:hover {
    background: var(--accent-dim);
    color: var(--text-primary);
    border-color: var(--accent);
}
.btn-ghost.active {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}
.btn-ghost svg { width: 16px; height: 16px; flex-shrink: 0; }

:where(a, button, input, textarea, select, [tabindex]):focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

/* ── Input ── */
.text-input {
    width: 100%;
    padding: 12px 16px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.92rem;
    outline: none;
    transition: border-color var(--duration) var(--ease-out),
                box-shadow var(--duration) var(--ease-out);
}
.text-input::placeholder { color: var(--text-muted); }
.text-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

[data-theme="light"] :is(.text-input, input, textarea, select) {
    background: #ffffff;
    border-color: #d7dee8;
    color: #111827;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.75);
}

[data-theme="light"] :is(.text-input, input, textarea, select)::placeholder {
    color: #64748b;
    opacity: 1;
}

[data-theme="light"] :is(.text-input, input, textarea, select):focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim), inset 0 1px 0 rgba(255,255,255,0.75);
}

/* ── Quick Pick Chips ── */
.quick-picks { display: flex; flex-direction: column; gap: 8px; }
.quick-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.quick-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
    padding: 5px 12px;
    font-size: 0.78rem;
    font-family: var(--font-sans);
    font-weight: 500;
    background: var(--surface-inset);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--duration) var(--ease-out);
}
.chip:hover {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-1px);
}

[data-theme="light"] .chip,
[data-theme="light"] .btn-ghost,
[data-theme="light"] .back-link,
[data-theme="light"] .theme-toggle {
    background: #ffffff;
    border-color: #d7dee8;
    color: #334155;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

[data-theme="light"] .chip:hover,
[data-theme="light"] .btn-ghost:hover,
[data-theme="light"] .back-link:hover,
[data-theme="light"] .theme-toggle:hover {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}

[data-theme="light"] .card-title {
    color: #1f2937;
}

[data-theme="light"] :is(.info-placeholder, .placeholder-text, .radar-placeholder, .pk-placeholder, .egg-placeholder, .filters-placeholder, .empty-state, .empty-text, .empty-hint) {
    color: #475569;
}

/* ── Status Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 10px;
    font-size: 0.72rem;
    font-weight: 600;
    border-radius: 999px;
    letter-spacing: 0.03em;
}
.badge-active   { background: var(--accent-dim);         color: var(--accent);         border: 1px solid var(--accent-glow); }
.badge-purple   { background: var(--accent-purple-dim);  color: var(--accent-purple);  border: 1px solid var(--accent-purple-glow); }
.badge-green    { background: var(--accent-green-dim);   color: var(--accent-green);   border: 1px solid var(--accent-green-glow); }
.badge-gold     { background: var(--accent-gold-dim);    color: var(--accent-gold);    border: 1px solid var(--accent-gold-glow); }
.badge-soon     { background: var(--warning-bg);          color: var(--warning);        border: 1px solid rgba(245,158,11,0.3); }
.badge-pass     { background: var(--success-bg);          color: var(--success);        border: 1px solid rgba(0,229,160,0.3); }
.badge-fail     { background: var(--danger-bg);           color: var(--danger);         border: 1px solid rgba(255,77,106,0.3); }

/* ── Error Toast ── */
.toast {
    position: fixed;
    bottom: 32px; left: 50%;
    transform: translateX(-50%) translateY(20px);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 22px;
    background: var(--danger-bg);
    border: 1px solid rgba(255,77,106,0.25);
    border-radius: var(--radius-md);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 8px 32px rgba(255,77,106,0.15);
    z-index: 1000;
    opacity: 0;
    transition: all 0.4s var(--ease-out);
}
[data-theme="light"] .toast { border-color: rgba(214, 48, 80, 0.2); box-shadow: 0 8px 32px rgba(214, 48, 80, 0.12); }
.toast.visible { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.hidden  { display: none; }
.toast-icon    { font-size: 1.1rem; }
.toast-message { font-size: 0.88rem; color: var(--danger); font-weight: 500; }
.toast-close   {
    background: none; border: none;
    color: var(--danger); font-size: 1.2rem;
    cursor: pointer; padding: 4px;
    opacity: 0.6; transition: opacity var(--duration);
}
.toast-close:hover { opacity: 1; }

/* ── Theme Toggle Button ── */
.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    min-height: 40px;
    padding: 8px 15px 8px 11px;
    background: var(--surface-inset);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.79rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: background var(--duration) var(--ease-out),
                border-color var(--duration) var(--ease-out),
                color var(--duration) var(--ease-out),
                box-shadow var(--duration) var(--ease-out);
    white-space: nowrap;
    position: relative;
}
.theme-toggle:hover {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 16px var(--accent-dim);
}
.theme-toggle-icons {
    position: relative;
    width: 17px;
    height: 17px;
    flex-shrink: 0;
}
.theme-toggle-icons svg {
    position: absolute;
    top: 0; left: 0;
    width: 17px; height: 17px;
    transition: opacity 0.25s ease, transform 0.35s var(--ease-out);
}
.icon-sun  { opacity: 1;  transform: rotate(0deg); }
.icon-moon { opacity: 0; transform: rotate(-30deg); }
[data-theme="light"] .icon-sun  { opacity: 0;  transform: rotate(30deg); }
[data-theme="light"] .icon-moon { opacity: 1; transform: rotate(0deg); }

.github-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--text-secondary);
    background: var(--surface-inset);
    border: 1px solid var(--glass-border);
    border-radius: 999px;
    text-decoration: none;
    transition: background var(--duration) var(--ease-out),
                border-color var(--duration) var(--ease-out),
                color var(--duration) var(--ease-out),
                box-shadow var(--duration) var(--ease-out),
                transform 180ms ease;
}
.github-link svg {
    width: 19px;
    height: 19px;
}
.github-link:hover {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 0 16px var(--accent-dim);
    transform: translateY(-1px);
}

[data-theme="light"] .github-link {
    background: #ffffff;
    border-color: #d7dee8;
    color: #334155;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}
[data-theme="light"] .github-link:hover {
    background: var(--accent-dim);
    border-color: var(--accent);
    color: var(--accent);
}

[data-theme="light"] :is(.app-title, .purple-title) {
    background: linear-gradient(135deg, #e91e8c 0%, #c21875 48%, #7b1fa2 100%) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    background-clip: text !important;
}

/* ── Skeleton Loading ── */
.skeleton-block {
    height: 18px;
    background: linear-gradient(90deg,
        rgba(255,255,255,0.04) 25%,
        rgba(255,255,255,0.08) 50%,
        rgba(255,255,255,0.04) 75%);
    background-size: 200% 100%;
    border-radius: var(--radius-sm);
    animation: shimmer 1.5s ease-in-out infinite;
}
[data-theme="light"] .skeleton-block {
    background: linear-gradient(90deg,
        rgba(181, 0, 95, 0.05) 25%,
        rgba(181, 0, 95, 0.11) 50%,
        rgba(181, 0, 95, 0.05) 75%);
    background-size: 200% 100%;
}
.skeleton-block.short { width: 60%; }

@keyframes shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.app-footer {
    text-align: center;
    padding: 20px 0 24px;
    font-size: 0.78rem;
    color: var(--text-muted);
}
.app-footer a { color: var(--accent); text-decoration: none; transition: color var(--duration); }
.app-footer a:hover { color: var(--accent-purple); }
.heart { color: var(--danger); display: inline-block; animation: heartbeat 1.5s ease-in-out infinite; }
@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50%       { transform: scale(1.15); }
}
.footer-sub { margin-top: 4px; font-size: 0.72rem; opacity: 0.5; }

/* ── Generic Loading Overlay ── */
.loading-overlay {
    position: absolute;
    inset: 0;
    background: var(--bg-surface);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 50;
    border-radius: inherit;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s var(--ease-out);
}
.loading-overlay.active {
    opacity: 1;
    pointer-events: all;
}
.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(0, 229, 255, 0.1);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite, glowPulse 2s ease-in-out infinite;
}
.loading-text {
    margin-top: 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 0.05em;
    animation: pulse 2s ease-in-out infinite;
}

.loading-note {
    margin-bottom: 2px;
    font-size: 0.82rem;
    color: var(--text-secondary);
}
@keyframes glowPulse {
    0%, 100% { box-shadow: 0 0 10px var(--accent-dim); }
    50% { box-shadow: 0 0 20px var(--accent-glow); }
}
@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* ── Desktop Ambient Cursor Glow ── */
#desktop-cursor-glow {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    pointer-events: none;
    background: radial-gradient(
        600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
        var(--ambient-glow),
        transparent 40%
    );
    z-index: 0;
}

/* ── Info Divider ── */
.info-divider { height: 1px; background: var(--divider); margin: 4px 0; }

/* ── Utility ── */
.hidden { display: none !important; }
.mono   { font-family: var(--font-mono); }

/* ── Responsive ── */
@media (max-width: 960px) {
    .app-container { padding: 0 14px; }
    .app-title     { font-size: 1.25rem; }
    .header-content { gap: 14px; }
}

@media (max-width: 600px) {
    .header-content {
        align-items: flex-start;
        flex-direction: column;
    }

    .back-link,
    .header-controls {
        align-self: flex-start;
    }

    .toast {
        left: 14px;
        right: 14px;
        transform: translateY(20px);
    }

    .toast.visible {
        transform: translateY(0);
    }
}