/* ==========================================================================
   魅思CMS · Design System  (Phase 1 — Foundation)
   Aesthetic: "Deep Space Aurora" — dark, futuristic, refined.
   Influences: Apple / Stripe / Linear product sites.
   Pure CSS, no jQuery. UTF-8.
   --------------------------------------------------------------------------
   Sections
   01. Design Tokens (CSS custom properties)
   02. Base / Reset / Global transitions
   03. Typography helpers (gradient text, glow text)
   04. Glassmorphism (.glass-card / .glass-nav / .glass-panel)
   05. Gradient borders (static + animated conic)
   06. Glow effects (.glow / .glow-hover / .text-glow / aurora orbs)
   07. Backgrounds (.bg-grid / .bg-aurora / .bg-noise / .bg-radial)
   08. Buttons (.btn-primary / .btn-ghost / .chip)
   09. Scroll reveal animations (.fade-in-* + .stagger-*)
   10. Custom scrollbar (dark theme)
   11. Reading progress bar
   12. Pagination component
   13. Utilities (misc, marquee, shine, cursor-glow)
   14. Reduced motion / responsive safety
   ========================================================================== */

/* ==========================================================================
   01. Design Tokens
   ========================================================================== */
:root {
    /* Surfaces */
    --bg-primary: #0A0A1A;
    --bg-secondary: #111827;
    --bg-tertiary: #0F1424;
    --bg-elevated: #151B2E;
    --bg-glass: rgba(255, 255, 255, 0.05);
    --bg-glass-strong: rgba(255, 255, 255, 0.08);

    /* Accents */
    --accent-start: #6366F1;   /* Indigo  */
    --accent-end: #8B5CF6;     /* Violet  */
    --accent-glow: #A78BFA;    /* Highlight */
    --accent-cyan: #22D3EE;    /* Secondary sparkle */
    --accent-pink: #EC4899;    /* Tertiary sparkle */

    /* Text */
    --text-primary: #F9FAFB;
    --text-secondary: #9CA3AF;
    --text-muted: #6B7280;

    /* Lines */
    --border: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.18);
    --border-subtle: rgba(255, 255, 255, 0.06);

    /* Gradients */
    --gradient-accent: linear-gradient(135deg, var(--accent-start) 0%, var(--accent-end) 100%);
    --gradient-accent-soft: linear-gradient(135deg, rgba(99, 102, 241, 0.18) 0%, rgba(139, 92, 246, 0.18) 100%);
    --gradient-text: linear-gradient(120deg, #C7D2FE 0%, #A78BFA 40%, #8B5CF6 70%, #22D3EE 100%);
    --gradient-aurora: linear-gradient(120deg, #6366F1, #8B5CF6, #22D3EE, #EC4899, #6366F1);

    /* Shadows / glows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 30px -10px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, 0.75);
    --glow-accent: 0 0 24px rgba(139, 92, 246, 0.45);
    --glow-accent-lg: 0 0 60px rgba(99, 102, 241, 0.35);

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    /* Motion */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-soft: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --dur-fast: 0.2s;
    --dur-base: 0.35s;
    --dur-slow: 0.6s;

    /* Layout */
    --nav-height: 76px;
    --container: 1200px;

    /* Fonts */
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-display: 'Poppins', 'Noto Sans SC', 'Inter', system-ui, sans-serif;
}

/* ==========================================================================
   02. Base / Reset / Global transitions
   ========================================================================== */
* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: var(--nav-height);
}

body {
    margin: 0;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* Ambient base atmosphere: layered radial aurora behind everything */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
    background:
        radial-gradient(60rem 40rem at 12% -8%, rgba(99, 102, 241, 0.16), transparent 60%),
        radial-gradient(50rem 40rem at 100% 0%, rgba(139, 92, 246, 0.14), transparent 55%),
        radial-gradient(45rem 35rem at 50% 120%, rgba(34, 211, 238, 0.08), transparent 60%);
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--dur-base) var(--ease-soft),
                opacity var(--dur-base) var(--ease-soft);
}

::selection {
    background: rgba(139, 92, 246, 0.35);
    color: #fff;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
}

/* Global smooth transitions for interactive elements */
button,
input,
textarea,
select,
.transition-smooth {
    transition: all var(--dur-base) var(--ease-soft);
}

.container-ms {
    width: 100%;
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: 1.25rem;
}

/* ==========================================================================
   03. Typography helpers
   ========================================================================== */
.text-gradient {
    background-image: var(--gradient-text);
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
    animation: textShimmer 6s linear infinite;
}

.text-gradient-static {
    background-image: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.text-glow {
    text-shadow: 0 0 18px rgba(167, 139, 250, 0.55), 0 0 42px rgba(99, 102, 241, 0.28);
}

.text-balance {
    text-wrap: balance;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent-glow);
}

@keyframes textShimmer {
    to { background-position: 200% center; }
}

/* ==========================================================================
   04. Glassmorphism
   ========================================================================== */
.glass-card {
    position: relative;
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    transition: transform var(--dur-base) var(--ease-out),
                border-color var(--dur-base) var(--ease-soft),
                box-shadow var(--dur-base) var(--ease-soft),
                background var(--dur-base) var(--ease-soft);
    overflow: hidden;
}

.glass-card::after {
    /* subtle top sheen */
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    background: linear-gradient(160deg, rgba(255, 255, 255, 0.07), transparent 42%);
    opacity: 0.7;
}

.glass-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-strong);
    background: var(--bg-glass-strong);
    box-shadow: var(--shadow-lg), var(--glow-accent), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.glass-panel {
    background: rgba(17, 24, 39, 0.6);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    backdrop-filter: blur(14px) saturate(130%);
    -webkit-backdrop-filter: blur(14px) saturate(130%);
}

.glass-nav {
    background: rgba(10, 10, 26, 0.55);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    border-bottom: 1px solid transparent;
    transition: background var(--dur-base) var(--ease-soft),
                border-color var(--dur-base) var(--ease-soft),
                box-shadow var(--dur-base) var(--ease-soft);
}

/* Scrolled state — applied by mscms.js */
.glass-nav.nav-scrolled {
    background: rgba(10, 10, 26, 0.82);
    border-bottom-color: var(--border);
    box-shadow: 0 12px 40px -12px rgba(0, 0, 0, 0.8);
}

/* ==========================================================================
   05. Gradient borders
   ========================================================================== */
.gradient-border {
    position: relative;
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    background-clip: padding-box;
    border: 1px solid transparent;
}

.gradient-border::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: var(--gradient-accent);
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* Animated conic gradient border */
.gradient-border-animated {
    position: relative;
    border-radius: var(--radius-lg);
    isolation: isolate;
    overflow: hidden;
    background: var(--bg-secondary);
}

.gradient-border-animated::before {
    content: "";
    position: absolute;
    z-index: -2;
    left: 50%;
    top: 50%;
    width: 220%;
    aspect-ratio: 1;
    translate: -50% -50%;
    background: conic-gradient(from 0deg,
        transparent 0deg,
        var(--accent-start) 60deg,
        var(--accent-end) 120deg,
        var(--accent-cyan) 180deg,
        transparent 260deg,
        transparent 360deg);
    animation: borderSpin 5s linear infinite;
    pointer-events: none;
}

.gradient-border-animated::after {
    content: "";
    position: absolute;
    z-index: -1;
    inset: 1.5px;
    border-radius: calc(var(--radius-lg) - 1.5px);
    background: var(--bg-secondary);
    pointer-events: none;
}

@keyframes borderSpin {
    to { rotate: 360deg; }
}

/* Thin gradient divider line */
.gradient-rule {
    height: 1px;
    width: 100%;
    border: 0;
    background: linear-gradient(90deg, transparent, var(--accent-start), var(--accent-end), var(--accent-cyan), transparent);
    opacity: 0.6;
}

/* ==========================================================================
   06. Glow effects
   ========================================================================== */
.glow {
    box-shadow: var(--glow-accent);
}

.glow-lg {
    box-shadow: var(--glow-accent-lg);
}

.glow-hover {
    transition: box-shadow var(--dur-base) var(--ease-soft), transform var(--dur-base) var(--ease-out);
}

.glow-hover:hover {
    box-shadow: 0 0 34px rgba(139, 92, 246, 0.55), 0 0 70px rgba(99, 102, 241, 0.28);
}

/* Aurora floating orbs (decorative) */
.aurora-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(70px);
    opacity: 0.5;
    pointer-events: none;
    z-index: 0;
    animation: orbFloat 14s ease-in-out infinite;
}

.aurora-orb.orb-indigo { background: radial-gradient(circle, rgba(99, 102, 241, 0.9), transparent 70%); }
.aurora-orb.orb-violet { background: radial-gradient(circle, rgba(139, 92, 246, 0.9), transparent 70%); }
.aurora-orb.orb-cyan   { background: radial-gradient(circle, rgba(34, 211, 238, 0.75), transparent 70%); }
.aurora-orb.orb-pink   { background: radial-gradient(circle, rgba(236, 72, 153, 0.6), transparent 70%); }

@keyframes orbFloat {
    0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
    33%      { transform: translate3d(30px, -40px, 0) scale(1.08); }
    66%      { transform: translate3d(-25px, 25px, 0) scale(0.95); }
}

/* ==========================================================================
   07. Backgrounds
   ========================================================================== */
.bg-grid {
    background-size: 44px 44px;
    background-image:
        linear-gradient(to right, rgba(255, 255, 255, 0.045) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
    mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
}

.bg-dots {
    background-size: 22px 22px;
    background-image: radial-gradient(rgba(255, 255, 255, 0.09) 1px, transparent 1px);
}

.bg-radial {
    background: radial-gradient(ellipse 70% 55% at 50% 0%, rgba(99, 102, 241, 0.18), transparent 70%);
}

.bg-aurora {
    background:
        radial-gradient(50rem 30rem at 15% 10%, rgba(99, 102, 241, 0.20), transparent 60%),
        radial-gradient(45rem 30rem at 85% 20%, rgba(139, 92, 246, 0.18), transparent 60%),
        radial-gradient(40rem 30rem at 50% 100%, rgba(34, 211, 238, 0.10), transparent 60%);
}

.bg-noise {
    position: relative;
}

.bg-noise::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.035;
    mix-blend-mode: overlay;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ==========================================================================
   08. Buttons
   ========================================================================== */
.btn-primary {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    padding: 0.8rem 1.6rem;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    color: #fff;
    background: var(--gradient-accent);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    overflow: hidden;
    isolation: isolate;
    box-shadow: 0 8px 24px -8px rgba(99, 102, 241, 0.7);
    transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-soft);
}

.btn-primary::before {
    /* moving sheen */
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background: linear-gradient(120deg, transparent 20%, rgba(255, 255, 255, 0.35) 50%, transparent 80%);
    transform: translateX(-120%);
    transition: transform 0.7s var(--ease-out);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 40px -10px rgba(139, 92, 246, 0.85), var(--glow-accent);
}

.btn-primary:hover::before {
    transform: translateX(120%);
}

.btn-primary:active {
    transform: translateY(0) scale(0.98);
}

.btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    padding: 0.78rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
    transition: transform var(--dur-base) var(--ease-out),
                background var(--dur-base) var(--ease-soft),
                border-color var(--dur-base) var(--ease-soft),
                box-shadow var(--dur-base) var(--ease-soft);
}

.btn-ghost:hover {
    transform: translateY(-2px);
    background: var(--bg-glass-strong);
    border-color: var(--accent-glow);
    box-shadow: 0 10px 30px -12px rgba(139, 92, 246, 0.6);
}

.btn-ghost:active {
    transform: translateY(0) scale(0.98);
}

/* Small pill / chip */
.chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.85rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

/* ==========================================================================
   09. Scroll reveal animations
   Elements start hidden; mscms.js adds .visible when in viewport.
   ========================================================================== */
.fade-in-up,
.fade-in-left,
.fade-in-right,
.fade-in-scale,
.fade-in {
    opacity: 0;
    will-change: transform, opacity;
    transition: opacity 0.75s var(--ease-out), transform 0.75s var(--ease-out);
}

.fade-in-up     { transform: translate3d(0, 40px, 0); }
.fade-in-left   { transform: translate3d(-48px, 0, 0); }
.fade-in-right  { transform: translate3d(48px, 0, 0); }
.fade-in-scale  { transform: scale(0.94); }
.fade-in        { transform: none; }

.fade-in-up.visible,
.fade-in-left.visible,
.fade-in-right.visible,
.fade-in-scale.visible,
.fade-in.visible {
    opacity: 1;
    transform: none;
}

/* Stagger delays */
.stagger-1 { transition-delay: 0.08s; }
.stagger-2 { transition-delay: 0.16s; }
.stagger-3 { transition-delay: 0.24s; }
.stagger-4 { transition-delay: 0.32s; }
.stagger-5 { transition-delay: 0.40s; }

/* ==========================================================================
   10. Custom scrollbar (dark theme)
   ========================================================================== */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(139, 92, 246, 0.5) rgba(255, 255, 255, 0.04);
}

::-webkit-scrollbar {
    width: 11px;
    height: 11px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.03);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--accent-start), var(--accent-end));
    border-radius: var(--radius-full);
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--accent-glow), var(--accent-end));
    background-clip: padding-box;
}

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

.scrollbar-hide {
    -ms-overflow-style: none;
    scrollbar-width: none;
}
.scrollbar-hide::-webkit-scrollbar { display: none; }

/* ==========================================================================
   11. Reading progress bar (article pages)
   ========================================================================== */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    z-index: 100;
    background: var(--gradient-aurora);
    background-size: 300% 100%;
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.7);
    transition: width 0.1s linear;
    animation: progressShimmer 3s linear infinite;
}

@keyframes progressShimmer {
    to { background-position: 300% 0; }
}

/* ==========================================================================
   12. Pagination component
   ========================================================================== */
.ms-pagination {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin: 2.5rem 0;
}

.ms-pagination a,
.ms-pagination span,
.ms-pagination li {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.5rem;
    height: 2.5rem;
    padding: 0 0.85rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    list-style: none;
    transition: all var(--dur-base) var(--ease-soft);
}

.ms-pagination a:hover {
    color: #fff;
    border-color: var(--accent-glow);
    background: var(--bg-glass-strong);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px -8px rgba(139, 92, 246, 0.6);
}

.ms-pagination .current,
.ms-pagination .active,
.ms-pagination a.active,
.ms-pagination span.current {
    color: #fff;
    background: var(--gradient-accent);
    border-color: transparent;
    box-shadow: 0 8px 22px -8px rgba(99, 102, 241, 0.8);
}

.ms-pagination .disabled,
.ms-pagination a.disabled {
    opacity: 0.4;
    pointer-events: none;
}

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

.skip-link {
    position: absolute;
    left: 24px;
    top: -60px;
    z-index: 9999;
    padding: 12px 22px;
    background: var(--gradient-accent);
    color: #fff;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: top var(--dur-base) var(--ease-out);
}
.skip-link:focus { top: 16px; }

.content-auto { content-visibility: auto; }

.shadow-glow { box-shadow: var(--glow-accent); }

.divider-glow {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(139, 92, 246, 0.5), transparent);
}

/* Marquee */
.marquee {
    display: flex;
    width: max-content;
    animation: marquee 32s linear infinite;
}
.marquee:hover { animation-play-state: paused; }
@keyframes marquee {
    to { transform: translateX(-50%); }
}

/* Shine sweep for cards on hover */
.shine {
    position: relative;
    overflow: hidden;
}
.shine::before {
    content: "";
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.14), transparent);
    transform: skewX(-20deg);
    transition: left 0.7s var(--ease-out);
    pointer-events: none;
    z-index: 3;
}
.shine:hover::before { left: 130%; }

/* Cursor glow — a soft radial light that follows the pointer (desktop) */
.cursor-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 520px;
    height: 520px;
    border-radius: 50%;
    pointer-events: none;
    z-index: 1;
    opacity: 0;
    transform: translate3d(-50%, -50%, 0);
    background: radial-gradient(circle, rgba(139, 92, 246, 0.14), rgba(99, 102, 241, 0.06) 40%, transparent 70%);
    transition: opacity var(--dur-slow) var(--ease-soft);
    will-change: transform;
}
.cursor-glow.active { opacity: 1; }

/* Back-to-top button */
#backToTop {
    background: var(--gradient-accent);
    color: #fff;
    box-shadow: 0 10px 30px -8px rgba(99, 102, 241, 0.7);
}
#backToTop:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px -8px rgba(139, 92, 246, 0.9);
}
#backToTop.visible {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0);
}

/* QQ floating contact button */
.qq-float {
    background: var(--gradient-accent);
    box-shadow: 0 10px 30px -8px rgba(99, 102, 241, 0.75);
    animation: qqPulse 2.8s ease-in-out infinite;
}
@keyframes qqPulse {
    0%, 100% { box-shadow: 0 10px 30px -8px rgba(99, 102, 241, 0.75), 0 0 0 0 rgba(139, 92, 246, 0.5); }
    50%      { box-shadow: 0 10px 30px -8px rgba(99, 102, 241, 0.75), 0 0 0 14px rgba(139, 92, 246, 0); }
}

/* Underline reveal for nav links */
.nav-link {
    position: relative;
}
.nav-link::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 2px;
    width: 0;
    height: 2px;
    border-radius: 2px;
    background: var(--gradient-accent);
    transform: translateX(-50%);
    transition: width var(--dur-base) var(--ease-out);
}
.nav-link:hover::after,
.nav-link.active::after {
    width: 60%;
}

/* Mobile menu panel */
.mobile-menu {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    visibility: hidden;
    background: rgba(10, 10, 26, 0.96);
    backdrop-filter: blur(20px) saturate(160%);
    -webkit-backdrop-filter: blur(20px) saturate(160%);
    border-top: 1px solid transparent;
    transition: max-height 0.45s var(--ease-out), opacity 0.3s var(--ease-soft), visibility 0.3s;
}
.mobile-menu.open {
    max-height: 80vh;
    opacity: 1;
    visibility: visible;
    overflow-y: auto;
    border-top-color: var(--border);
}

/* Carousel dots */
.carousel-dot {
    width: 8px;
    height: 8px;
    padding: 0;
    border: none;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.28);
    cursor: pointer;
    transition: all var(--dur-base) var(--ease-soft);
}
.carousel-dot:hover { background: rgba(255, 255, 255, 0.5); }
.carousel-dot.active {
    width: 26px;
    background: var(--gradient-accent);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.6);
}
[data-carousel-dots] {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.25rem;
}
[data-carousel-track] {
    display: flex;
    will-change: transform;
}

/* Modal tab (download modal Android/iOS) */
.tab-active {
    color: #fff !important;
    background: var(--gradient-accent);
    box-shadow: 0 6px 18px -8px rgba(99, 102, 241, 0.9);
}

/* ==========================================================================
   14. Reduced motion / responsive safety
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }
    .fade-in-up, .fade-in-left, .fade-in-right, .fade-in-scale, .fade-in {
        opacity: 1 !important;
        transform: none !important;
    }
    .cursor-glow { display: none; }
}

/* Touch devices: disable hover-lift to avoid sticky hover states */
@media (hover: none) {
    .glass-card:hover { transform: none; }
    .btn-primary:hover, .btn-ghost:hover { transform: none; }
    .cursor-glow { display: none; }
}

@media (max-width: 768px) {
    :root { --nav-height: 64px; }
    .container-ms { padding-inline: 1rem; }
}