/* StudyFlow — Global Modern UI v3 */

/* ── Base background ── */
body {
    background: #0b1638 !important;
    color: #e2e8f0;
}

/* ── Atmospheric mesh + subtle grid texture ── */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        linear-gradient(rgba(56,189,248,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(56,189,248,0.035) 1px, transparent 1px),
        radial-gradient(ellipse 90% 70% at 8% 12%, rgba(14,165,233,0.28) 0%, transparent 55%),
        radial-gradient(ellipse 70% 55% at 92% 82%, rgba(99,102,241,0.18) 0%, transparent 55%),
        radial-gradient(ellipse 50% 40% at 55% 45%, rgba(34,211,238,0.12) 0%, transparent 50%);
    background-size: 52px 52px, 52px 52px, 100% 100%, 100% 100%, 100% 100%;
    pointer-events: none;
    z-index: 0;
    animation: sfMeshShift 16s ease-in-out infinite alternate;
}

@keyframes sfMeshShift {
    0%   { opacity: 0.55; }
    50%  { opacity: 1; }
    100% { opacity: 0.55; }
}

/* ── All page containers above mesh ── */
nav, .top-nav, .container, .sidebar, .sf-layout, .sf-main,
[class*="card"], [class*="panel"], [class*="section"],
.page-header, .result-section, #app, main, header, footer {
    position: relative;
    z-index: 1;
}

/* ── Navbar glass upgrade ── */
.top-nav {
    background: rgba(5, 10, 28, 0.90) !important;
    backdrop-filter: blur(28px) saturate(160%) !important;
    -webkit-backdrop-filter: blur(28px) saturate(160%) !important;
    border-bottom: 1px solid rgba(56,189,248,0.16) !important;
    box-shadow: 0 1px 0 rgba(56,189,248,0.05) !important;
}

/* ── Card glass upgrade ── */
.upload-card, .settings-card, .result-content,
.glass-card, .input-card {
    background: rgba(6, 11, 28, 0.78) !important;
    backdrop-filter: blur(32px) !important;
    -webkit-backdrop-filter: blur(32px) !important;
    border: 1px solid rgba(56,189,248,0.18) !important;
    box-shadow: 0 4px 40px rgba(0,0,0,0.34), 0 0 42px rgba(56,189,248,0.055), inset 0 1px 0 rgba(255,255,255,0.07) !important;
}

/* ── Card section h2 titles ── */
.input-card h2, .settings-card h2 {
    font-size: 16px !important;
    color: #dde8f8 !important;
    font-weight: 600 !important;
    letter-spacing: -0.02em !important;
}

/* ── Primary action buttons ── */
.generate-btn,
button.primary-btn,
[id*="generate"], [id*="summarize"], [id*="expand"], [id*="solve"], [id*="explain"] {
    background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 48%, #7c3aed 100%) !important;
    border: none !important;
    box-shadow: 0 4px 22px rgba(14,165,233,0.34), 0 1px 0 rgba(255,255,255,0.14) inset !important;
    transition: all 0.25s ease !important;
}

.generate-btn:hover:not(:disabled),
button.primary-btn:hover:not(:disabled) {
    transform: translateY(-2px) !important;
    box-shadow: 0 8px 32px rgba(79,70,229,0.55), 0 0 48px rgba(99,102,241,0.2) !important;
}

/* ── Select elements ── */
select {
    background: rgba(10, 17, 38, 0.8) !important;
    border: 1px solid rgba(56,189,248,0.25) !important;
    border-radius: 12px !important;
    color: #e2e8f0 !important;
    transition: border-color 0.2s ease !important;
}

select:focus {
    outline: none !important;
    border-color: rgba(59,130,246,0.5) !important;
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1) !important;
}

/* ── Text inputs & textareas ── */
input[type="text"], input[type="email"], input[type="password"],
textarea {
    background: rgba(10, 17, 38, 0.65) !important;
    border: 1px solid rgba(56,189,248,0.18) !important;
    border-radius: 12px !important;
    color: #e2e8f0 !important;
    transition: border-color 0.2s, box-shadow 0.2s !important;
}

input[type="text"]:focus, input[type="email"]:focus,
input[type="password"]:focus, textarea:focus {
    border-color: rgba(59,130,246,0.5) !important;
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1) !important;
    outline: none !important;
}

/* ── Page header glow ── */
.page-header {
    position: relative;
    padding-top: 12px;
}

.page-header::before {
    content: '';
    position: absolute;
    width: 560px; height: 180px;
    background: radial-gradient(ellipse at center, rgba(56,189,248,0.20) 0%, transparent 70%);
    top: -24px; left: 50%; transform: translateX(-50%);
    pointer-events: none;
    z-index: -1;
}

/* ── Page heading gradient ── */
.page-header h1 {
    background: linear-gradient(135deg, #38bdf8 0%, #818cf8 55%, #c084fc 100%) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    background-clip: text !important;
    letter-spacing: -0.03em !important;
}

/* ── Page eyebrow decoration ── */
.page-header-bar {
    width: 36px; height: 3px;
    background: linear-gradient(90deg, #3b82f6, #6366f1 60%, transparent);
    border-radius: 3px;
    margin: 0 auto 14px;
}

/* ── Mode cards upgrade ── */
.mode-card {
    border-color: rgba(56,189,248,0.18) !important;
    background: linear-gradient(145deg, rgba(8,20,48,0.86), rgba(8,14,32,0.72)) !important;
}

.mode-card:hover {
    border-color: rgba(56,189,248,0.50) !important;
    background: rgba(10,28,58,0.9) !important;
    box-shadow: 0 10px 38px rgba(14,165,233,0.20) !important;
}

.mode-card.active {
    border-color: rgba(56,189,248,0.70) !important;
    background: rgba(14,165,233,0.14) !important;
    box-shadow: 0 0 0 1px rgba(56,189,248,0.30), 0 8px 30px rgba(14,165,233,0.22) !important;
}

/* ── Demo readiness helper card ── */
.sf-demo-helper {
    max-width: 1120px;
    margin: -14px auto 28px;
    padding: 16px 18px;
    border: 1px solid rgba(56,189,248,0.22);
    border-radius: 18px;
    background:
        linear-gradient(135deg, rgba(14,165,233,0.15), rgba(37,99,235,0.08) 48%, rgba(251,191,36,0.08)),
        rgba(6, 15, 36, 0.72);
    box-shadow: 0 16px 42px rgba(2,8,23,0.28), inset 0 1px 0 rgba(255,255,255,0.08);
    backdrop-filter: blur(24px) saturate(150%);
    -webkit-backdrop-filter: blur(24px) saturate(150%);
    display: grid;
    grid-template-columns: minmax(190px, 0.8fr) 1.6fr;
    gap: 14px;
    align-items: center;
}

.sf-demo-helper strong {
    color: #e0f2fe;
    font-size: 14px;
}

.sf-demo-helper span {
    display: block;
    color: #8fd8ff;
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.11em;
    margin-bottom: 4px;
}

.sf-demo-helper ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
}

.sf-demo-helper li {
    color: #cbd5e1;
    font-size: 12.5px;
    line-height: 1.35;
    padding: 10px 11px;
    border-radius: 13px;
    background: rgba(15, 23, 42, 0.58);
    border: 1px solid rgba(148,163,184,0.12);
}

@media (max-width: 860px) {
    .sf-demo-helper {
        grid-template-columns: 1fr;
        margin: 0 16px 22px;
    }
    .sf-demo-helper ul {
        grid-template-columns: 1fr;
    }
}

/* ── Slider thumb accent ── */
input[type="range"]::-webkit-slider-thumb {
    background: linear-gradient(135deg, #3b82f6, #6366f1) !important;
    box-shadow: 0 2px 10px rgba(59,130,246,0.5) !important;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: rgba(8,14,32,0.4); }
::-webkit-scrollbar-thumb { background: rgba(59,130,246,0.3); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: rgba(59,130,246,0.55); }

/* ════════════════════════════════════════════════
   MOBILE — Tool Pages (quiz, summary, solve, etc.)
   ════════════════════════════════════════════════ */
@media (max-width: 768px) {
    /* Reduce background intensity */
    body::before {
        background:
            linear-gradient(rgba(56,189,248,0.02) 1px, transparent 1px),
            linear-gradient(90deg, rgba(56,189,248,0.015) 1px, transparent 1px),
            radial-gradient(ellipse 90% 70% at 8% 12%, rgba(14,165,233,0.10) 0%, transparent 55%),
            radial-gradient(ellipse 70% 55% at 92% 82%, rgba(99,102,241,0.07) 0%, transparent 55%),
            radial-gradient(ellipse 50% 40% at 55% 45%, rgba(34,211,238,0.05) 0%, transparent 50%) !important;
        background-size: 52px 52px, 52px 52px, 100% 100%, 100% 100%, 100% 100% !important;
    }

    /*
     * Tool pages (quiz/summary/solve/etc.) use a normal document flow.
     * html scrolls vertically; body is the scroll content.
     * NOTE: dashboard.html overrides these with its own inline media query.
     */
    html {
        overflow-x: hidden !important;
        overflow-y: auto !important;
        -webkit-overflow-scrolling: touch;
    }
    body {
        overflow-x: hidden !important;
        /* min-height keeps background gradient full-page */
        min-height: 100dvh !important;
        min-height: 100vh !important;  /* fallback */
    }

    /* Prevent any element from breaking horizontal layout */
    * { max-width: 100%; box-sizing: border-box; }
    img, video, canvas, iframe, table { max-width: 100%; }

    /* Top nav: compact on mobile */
    .top-nav {
        padding: 10px 16px !important;
    }
    .top-nav .logo {
        font-size: 17px !important;
    }

    /* Container: tighter margins */
    .container {
        margin-top: 14px !important;
        margin-bottom: 20px !important;
        padding-left: 16px !important;
        padding-right: 16px !important;
        /* Account for bottom nav added by sf_mobile_nav.js */
        padding-bottom: calc(80px + env(safe-area-inset-bottom, 12px)) !important;
    }

    /* Page header: compact */
    .page-header {
        margin-bottom: 16px !important;
        padding: 12px 0 !important;
    }
    .page-header h1 {
        font-size: 20px !important;
        line-height: 1.25 !important;
    }
    .page-header p {
        font-size: 13px !important;
        margin-top: 6px !important;
    }

    /* Upload / input cards: full width, reduced padding */
    .upload-card, .input-card, .result-content {
        padding: 16px !important;
        border-radius: 14px !important;
    }

    /* Mode cards: stack 1-column */
    .mode-card { min-width: 0 !important; }
    .mode-selection, [class*="mode-grid"], [class*="modes-grid"] {
        grid-template-columns: 1fr 1fr !important;
    }

    /* Prevent wide tables from breaking layout */
    table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }

    /* Generate button: full width on mobile */
    .generate-btn, button.primary-btn,
    [id*="generate"], [id*="summarize"], [id*="expand"] {
        width: 100% !important;
    }
}

@media (max-width: 480px) {
    .mode-selection, [class*="mode-grid"], [class*="modes-grid"] {
        grid-template-columns: 1fr !important;
    }
}

/* ── Mobile Bottom Navigation ─────────────────────────────────────────────── */
#sf-mob-nav {
    display: none;
}

@media (max-width: 768px) {
    #sf-mob-nav {
        display: flex;
        position: fixed;
        bottom: 0; left: 0; right: 0;
        z-index: 1000;
        background: rgba(6, 10, 28, 0.97);
        backdrop-filter: blur(24px) saturate(160%);
        -webkit-backdrop-filter: blur(24px) saturate(160%);
        border-top: 1px solid rgba(56, 189, 248, 0.18);
        padding: 8px 4px;
        padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px));
        box-shadow: 0 -4px 32px rgba(0, 0, 0, 0.5);
    }

    .sf-mob-item {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 3px;
        padding: 6px 2px;
        color: #475569;
        text-decoration: none;
        font-size: 10px;
        font-weight: 500;
        border: none;
        background: none;
        cursor: pointer;
        transition: color 0.18s;
        -webkit-tap-highlight-color: transparent;
    }

    .sf-mob-item:hover,
    .sf-mob-active {
        color: #38bdf8;
    }

    .sf-mob-icon {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .sf-mob-label {
        font-size: 9.5px;
        letter-spacing: -0.1px;
        line-height: 1;
    }

    /* Tools button — accent centre */
    .sf-mob-tools-btn {
        color: #fff;
    }
    .sf-mob-tools-btn .sf-mob-icon {
        width: 40px; height: 40px;
        background: linear-gradient(135deg, #3b82f6, #6366f1);
        border-radius: 12px;
        box-shadow: 0 4px 16px rgba(99, 102, 241, 0.5);
        margin-bottom: 1px;
    }
    .sf-mob-tools-btn .sf-mob-label {
        color: #94a3b8;
    }

    /* Tools overlay */
    #sf-tools-overlay {
        display: none;
        position: fixed;
        inset: 0;
        z-index: 2000;
        background: rgba(0, 0, 0, 0.7);
        backdrop-filter: blur(4px);
        align-items: flex-end;
    }
    #sf-tools-overlay.open {
        display: flex;
    }

    #sf-tools-sheet {
        width: 100%;
        background: #0d1a3a;
        border: 1px solid rgba(56, 189, 248, 0.2);
        border-radius: 20px 20px 0 0;
        padding: 20px 20px;
        padding-bottom: calc(20px + env(safe-area-inset-bottom, 0px));
        box-shadow: 0 -8px 40px rgba(0, 0, 0, 0.6);
    }

    .sf-tools-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 12px;
    }

    .sf-tool-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 6px;
        padding: 12px 4px;
        background: rgba(56, 189, 248, 0.05);
        border: 1px solid rgba(56, 189, 248, 0.12);
        border-radius: 12px;
        color: #94a3b8;
        text-decoration: none;
        font-size: 11px;
        font-weight: 500;
        text-align: center;
        -webkit-tap-highlight-color: transparent;
        transition: background 0.15s;
    }
    .sf-tool-item:active {
        background: rgba(56, 189, 248, 0.12);
    }
}


/* ═══════════════════════════════════════════════════════
   SF PREMIUM v2 — Design System Additions
   ═══════════════════════════════════════════════════════ */

/* ── Design Tokens ── */
:root {
  --sf-bg: #09102b;
  --sf-surface: rgba(7,14,35,0.82);
  --sf-surface-elevated: rgba(9,18,46,0.90);
  --sf-border: rgba(56,189,248,0.14);
  --sf-border-hover: rgba(56,189,248,0.35);
  --sf-accent-blue: #38bdf8;
  --sf-accent-purple: #c084fc;
  --sf-accent-green: #34d399;
  --sf-accent-amber: #fbbf24;
  --sf-accent-orange: #fb923c;
  --sf-accent-red: #f87171;
  --sf-text-primary: #f0f8ff;
  --sf-text-secondary: #7896b2;
  --sf-text-muted: #4b6280;
  --sf-gradient-primary: linear-gradient(135deg, #0ea5e9 0%, #2563eb 48%, #7c3aed 100%);
  --sf-radius-card: 14px;
  --sf-radius-btn: 10px;
}

/* ── Better Empty State Component ── */
.sf-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 28px 20px;
  gap: 8px;
}
.sf-empty-icon {
  font-size: 30px;
  opacity: 0.4;
  margin-bottom: 2px;
  filter: grayscale(0.2);
}
.sf-empty-title {
  color: #94a3b8;
  font-size: 13.5px;
  font-weight: 600;
  font-family: 'Sora', sans-serif;
  letter-spacing: -0.015em;
}
.sf-empty-desc {
  color: #4b6280;
  font-size: 12px;
  line-height: 1.6;
  max-width: 240px;
}
.sf-empty-cta {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: linear-gradient(135deg, rgba(14,165,233,0.14), rgba(37,99,235,0.09));
  border: 1px solid rgba(56,189,248,0.24);
  color: #38bdf8;
  font-size: 12.5px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 9px;
  text-decoration: none;
  margin-top: 6px;
  transition: all 0.2s ease;
}
.sf-empty-cta:hover {
  background: rgba(14,165,233,0.22);
  border-color: rgba(56,189,248,0.45);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(14,165,233,0.18);
}

/* ── Quick Action Buttons (Dashboard Topbar) ── */
.quick-actions {
  display: flex;
  gap: 8px;
  margin-top: 18px;
  align-items: center;
  flex-wrap: wrap;
}
.qa-btn-primary {
  background: var(--sf-gradient-primary);
  color: white;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.01em;
  padding: 9px 18px;
  border-radius: var(--sf-radius-btn);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  box-shadow: 0 4px 20px rgba(14,165,233,0.35), 0 1px 0 rgba(255,255,255,0.12) inset;
  transition: transform 0.22s, box-shadow 0.22s;
  white-space: nowrap;
  border: none;
  cursor: pointer;
}
.qa-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(14,165,233,0.52), 0 0 48px rgba(124,58,237,0.18);
}
.qa-btn-secondary {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.09);
  color: var(--sf-text-secondary);
  font-size: 12.5px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--sf-radius-btn);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.18s;
  white-space: nowrap;
}
.qa-btn-secondary:hover {
  background: rgba(255,255,255,0.07);
  color: #e2e8f0;
  border-color: rgba(255,255,255,0.18);
  transform: translateY(-1px);
}

/* ── Featured Tool Card (Quiz - blue) ── */
.tool-card.tool-featured {
  background: linear-gradient(135deg, rgba(14,165,233,0.10), rgba(37,99,235,0.07)) !important;
  border-color: rgba(37,99,235,0.28) !important;
  border-top-color: rgba(14,165,233,0.65) !important;
  box-shadow: 0 4px 24px rgba(0,0,0,0.30), 0 0 0 1px rgba(14,165,233,0.10) !important;
}
.tool-card.tool-featured:hover {
  box-shadow: 0 12px 40px rgba(14,165,233,0.22), 0 0 0 1px rgba(14,165,233,0.28) !important;
  transform: translateY(-4px) !important;
  border-color: rgba(37,99,235,0.50) !important;
}
.tool-card.tool-featured .tool-name {
  color: #bae6fd !important;
}

/* ── Featured Tool Card (Solve - violet) ── */
.tool-card.tool-featured-alt {
  background: linear-gradient(135deg, rgba(109,40,217,0.09), rgba(124,58,237,0.06)) !important;
  border-color: rgba(109,40,217,0.25) !important;
  border-top-color: rgba(124,58,237,0.60) !important;
  box-shadow: 0 4px 24px rgba(0,0,0,0.30), 0 0 0 1px rgba(109,40,217,0.10) !important;
}
.tool-card.tool-featured-alt:hover {
  box-shadow: 0 12px 40px rgba(109,40,217,0.18), 0 0 0 1px rgba(124,58,237,0.28) !important;
  transform: translateY(-4px) !important;
  border-color: rgba(109,40,217,0.45) !important;
}
.tool-card.tool-featured-alt .tool-name {
  color: #ddd6fe !important;
}

/* ── Recommended Action Card ── */
.sf-recommend-card {
  background: linear-gradient(135deg, rgba(14,165,233,0.08) 0%, rgba(37,99,235,0.06) 50%, rgba(124,58,237,0.07) 100%);
  border: 1px solid rgba(14,165,233,0.20);
  border-radius: 16px;
  padding: 20px 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 28px rgba(0,0,0,0.22), inset 0 1px 0 rgba(255,255,255,0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.sf-recommend-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, #0ea5e9, #2563eb 50%, #7c3aed);
  border-radius: 16px 16px 0 0;
}
.sf-recommend-card:hover {
  border-color: rgba(14,165,233,0.35);
  box-shadow: 0 8px 36px rgba(14,165,233,0.14), inset 0 1px 0 rgba(255,255,255,0.05);
}
.sf-recommend-icon {
  width: 46px; height: 46px;
  border-radius: 13px;
  background: rgba(14,165,233,0.14);
  border: 1px solid rgba(14,165,233,0.22);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.sf-recommend-content { flex: 1; min-width: 0; }
.sf-recommend-kicker {
  font-size: 9.5px; font-weight: 800; letter-spacing: 0.1em;
  text-transform: uppercase; color: #38bdf8; margin-bottom: 4px;
  display: block;
}
.sf-recommend-title {
  font-family: 'Sora', sans-serif;
  font-size: 15px; font-weight: 700;
  color: #f0f8ff; letter-spacing: -0.02em;
  margin-bottom: 3px;
}
.sf-recommend-desc {
  font-size: 12px; color: #4b7090; line-height: 1.4;
}
.sf-recommend-ctas {
  display: flex; gap: 8px; align-items: center; flex-shrink: 0;
}
.sf-recommend-btn-primary {
  background: var(--sf-gradient-primary);
  color: white; font-size: 12.5px; font-weight: 600;
  padding: 8px 16px; border-radius: 9px;
  text-decoration: none; white-space: nowrap;
  box-shadow: 0 3px 14px rgba(14,165,233,0.30);
  transition: all 0.2s;
}
.sf-recommend-btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 22px rgba(14,165,233,0.45);
}
.sf-recommend-btn-secondary {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  color: #7896b2; font-size: 12px; font-weight: 500;
  padding: 8px 14px; border-radius: 9px;
  text-decoration: none; white-space: nowrap;
  transition: all 0.18s;
}
.sf-recommend-btn-secondary:hover {
  background: rgba(255,255,255,0.08);
  color: #e2e8f0;
}

/* ── Section Label Improvement ── */
.sec-label {
  color: rgba(120,150,178,0.6) !important;
  font-size: 10px !important;
  font-weight: 800 !important;
  letter-spacing: 0.12em !important;
  text-transform: uppercase !important;
}

/* ── Typography Hierarchy ── */
.sf-h2 {
  font-family: 'Sora', sans-serif;
  font-size: 18px; font-weight: 700;
  color: #dde8f8;
  letter-spacing: -0.03em;
}
.sf-label {
  font-size: 10px; font-weight: 700;
  color: rgba(120,150,178,0.55);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ── Small Badges ── */
.sf-badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2.5px 7px;
  border-radius: 5px;
}
.sf-badge-ai {
  background: rgba(14,165,233,0.12);
  border: 1px solid rgba(56,189,248,0.20);
  color: #38bdf8;
}
.sf-badge-new {
  background: rgba(52,211,153,0.12);
  border: 1px solid rgba(52,211,153,0.22);
  color: #34d399;
}
.sf-badge-pro {
  background: rgba(251,191,36,0.10);
  border: 1px solid rgba(251,191,36,0.20);
  color: #fbbf24;
}

/* ── Micro-interactions: card focus ring ── */
.tool-card:focus-visible,
.info-card:focus-visible {
  outline: 2px solid rgba(56,189,248,0.5);
  outline-offset: 2px;
}

/* ── Mobile responsive adjustments ── */
@media (max-width: 768px) {
  .quick-actions { gap: 6px; }
  .qa-btn-primary { font-size: 12.5px; padding: 8px 14px; }
  .qa-btn-secondary { display: none; }
  .sf-recommend-card { flex-direction: column; align-items: flex-start; gap: 14px; }
  .sf-recommend-ctas { width: 100%; }
  .sf-recommend-btn-primary, .sf-recommend-btn-secondary { flex: 1; text-align: center; justify-content: center; }
}

/* ── Shared premium dark tokens: tool pages / empty states / cards ── */
:root {
  --sf-bg: #08142f;
  --sf-surface: rgba(10,24,56,0.86);
  --sf-surface-deep: rgba(5,10,27,0.86);
  --sf-border: rgba(125,211,252,0.18);
  --sf-border-strong: rgba(56,189,248,0.34);
  --sf-cyan: #38bdf8;
  --sf-cyan-soft: rgba(56,189,248,0.12);
  --sf-violet: #a78bfa;
  --sf-gradient-primary: linear-gradient(135deg, #38bdf8, #2563eb 52%, #7c3aed);
}

body {
  background:
    radial-gradient(circle at 14% 10%, rgba(56,189,248,0.20), transparent 34%),
    radial-gradient(circle at 86% 28%, rgba(124,58,237,0.16), transparent 32%),
    #08142f !important;
}

body::before {
  background-image:
    linear-gradient(rgba(125,211,252,0.060) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125,211,252,0.048) 1px, transparent 1px) !important;
  background-size: 72px 72px !important;
  opacity: 1 !important;
}

.page-header h1,
.sf-page-title {
  text-shadow: 0 0 34px rgba(56,189,248,0.20);
}

.page-header-bar {
  box-shadow: 0 0 28px rgba(56,189,248,0.18);
}

.upload-card,
.form-card,
.settings-card,
.result-card,
.result-content,
.glass-card,
.input-card,
.quiz-card,
.mode-card,
.upload-zone,
.sf-card {
  background: linear-gradient(145deg, var(--sf-surface), var(--sf-surface-deep)) !important;
  border-color: var(--sf-border) !important;
  box-shadow: 0 18px 56px rgba(2,8,23,0.34), inset 0 1px 0 rgba(255,255,255,0.04) !important;
}

.mode-card:hover,
.upload-zone:hover,
.sf-card:hover {
  border-color: var(--sf-border-strong) !important;
  box-shadow: 0 24px 76px rgba(2,8,23,0.46), 0 0 32px rgba(56,189,248,0.10) !important;
}

.primary-btn,
.generate-btn,
.submit-btn,
.sf-primary-btn,
button[type="submit"] {
  background: var(--sf-gradient-primary) !important;
  box-shadow: 0 18px 48px rgba(56,189,248,0.20), 0 0 44px rgba(124,58,237,0.18) !important;
}

.sf-empty,
.empty-state,
.empty-box {
  border: 1px dashed rgba(125,211,252,0.18) !important;
  border-radius: 18px !important;
  background: linear-gradient(135deg, rgba(56,189,248,0.055), rgba(124,58,237,0.040)) !important;
}

.sf-empty-icon,
.empty-icon {
  opacity: 0.78;
  filter: drop-shadow(0 0 16px rgba(56,189,248,0.16));
}

.sf-empty-cta,
.empty-state-cta {
  color: #7dd3fc !important;
}

/* Launch polish layer: shared tool-page depth and clearer empty states */
.upload-card,
.form-card,
.settings-card,
.result-card,
.result-content,
.glass-card,
.input-card,
.quiz-card,
.mode-card,
.upload-zone,
.sf-card {
  position: relative;
  overflow: hidden;
}

.upload-card::before,
.form-card::before,
.settings-card::before,
.result-card::before,
.result-content::before,
.glass-card::before,
.input-card::before,
.quiz-card::before,
.mode-card::before,
.upload-zone::before,
.sf-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.06), transparent 32%),
    radial-gradient(circle at 12% 0%, rgba(56, 189, 248, 0.10), transparent 26%);
  opacity: 0.55;
}

.upload-card > *,
.form-card > *,
.settings-card > *,
.result-card > *,
.result-content > *,
.glass-card > *,
.input-card > *,
.quiz-card > *,
.mode-card > *,
.upload-zone > *,
.sf-card > * {
  position: relative;
  z-index: 1;
}

.mode-card {
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease, background 0.22s ease !important;
}

.mode-card:hover {
  transform: translateY(-3px) !important;
}

.mode-card.active,
.mode-card.selected,
.mode-card[aria-selected="true"] {
  background:
    radial-gradient(circle at 16% 12%, rgba(56, 189, 248, 0.22), transparent 34%),
    linear-gradient(145deg, rgba(13, 43, 86, 0.96), rgba(19, 24, 66, 0.88)) !important;
  border-color: rgba(125, 211, 252, 0.50) !important;
  box-shadow: 0 26px 80px rgba(2, 8, 23, 0.50), 0 0 46px rgba(56, 189, 248, 0.16) !important;
}

input:focus,
textarea:focus,
select:focus {
  border-color: rgba(125, 211, 252, 0.58) !important;
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.12), 0 0 28px rgba(56, 189, 248, 0.08) !important;
  outline: none !important;
}

.primary-btn:hover,
.generate-btn:hover,
.submit-btn:hover,
.sf-primary-btn:hover,
button[type="submit"]:hover {
  transform: translateY(-1px);
  box-shadow: 0 22px 60px rgba(56, 189, 248, 0.28), 0 0 58px rgba(124, 58, 237, 0.22) !important;
}

.primary-btn:focus-visible,
.generate-btn:focus-visible,
.submit-btn:focus-visible,
.sf-primary-btn:focus-visible,
button[type="submit"]:focus-visible,
.sf-empty-cta:focus-visible,
.empty-state-cta:focus-visible {
  outline: 2px solid rgba(125, 211, 252, 0.58) !important;
  outline-offset: 3px !important;
}

.sf-empty,
.empty-state,
.empty-box {
  position: relative;
  overflow: hidden;
}

.sf-empty::before,
.empty-state::before,
.empty-box::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 24% 0%, rgba(56, 189, 248, 0.13), transparent 34%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.045), transparent 40%);
  opacity: 0.8;
}

.sf-empty > *,
.empty-state > *,
.empty-box > * {
  position: relative;
  z-index: 1;
}