/* ═══════════════════════════════════════════════════════════════
   BABUNTOO ACADEMY — DESIGN SYSTEM
   Built with UI/UX Pro Max Skill guidelines:
     Swiss Modernism 2.0 + Portfolio Grid pattern
     Priority 1: Accessibility (WCAG AA+)
     Priority 2: Touch & Interaction
     Priority 3: Performance
   ═══════════════════════════════════════════════════════════════ */

/* ─── DESIGN TOKENS (Semantic Color System) ────────────────── */
:root {
    --color-primary: #2563EB;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #dbeafe;
    --color-primary-bg: #eff6ff;
    --color-cta: #F97316;
    --color-cta-hover: #ea580c;
    --color-bg-page: #ffffff;
    --color-bg-section: #F8FAFC;
    --color-bg-card: #ffffff;
    --color-text-heading: #1E293B;
    --color-text-body: #475569;
    --color-text-muted: #64748B;
    --color-text-subtle: #94A3B8;
    --color-border: #E2E8F0;
    --color-border-hover: #CBD5E1;
    --color-success: #16a34a;
    --color-error: #dc2626;
    --color-surface-hover: #F1F5F9;

    /* Spacing (8dp system) */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --space-7: 48px;
    --space-8: 64px;

    /* Typography */
    --font-sans: 'Inter', system-ui, sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 400ms;

    /* Elevation (consistent shadow scale) */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --shadow-focus: 0 0 0 3px rgba(37,99,235,0.2);

    /* Z-Index scale (managed hierarchy) */
    --z-base: 0;
    --z-card: 10;
    --z-sticky: 20;
    --z-nav: 50;
    --z-modal: 100;
    --z-progress: 200;
    --z-preloader: 999;
}

/* ─── GLOBAL RESETS ────────────────────────────────────────── */
*,
*::before,
*::after {
    box-sizing: border-box;
}

/* Touch optimization — Critical Priority 2 */
a, button, [role="button"], input, select, textarea, .project-card, .service-card, .team-card {
    touch-action: manipulation;
}

/* ─── SKIP LINK (Accessibility — Critical Priority 1) ──────── */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    z-index: calc(var(--z-preloader) + 1);
    padding: var(--space-2) var(--space-4);
    background: var(--color-primary);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    border-radius: 0 0 8px 8px;
    text-decoration: none;
    transition: top var(--duration-fast) ease;
}
.skip-link:focus {
    top: 0;
    outline: none;
}

/* ─── FOCUS STATES (Accessibility — Critical Priority 1) ───── */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 4px;
}
input:focus-visible, select:focus-visible, textarea:focus-visible {
    outline: none;
    border-color: var(--color-primary) !important;
    box-shadow: var(--shadow-focus) !important;
}

/* ─── CUSTOM SCROLLBAR ─────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg-page); }
::-webkit-scrollbar-thumb { background: var(--color-primary); border-radius: 3px; }

/* ─── PRELOADER ────────────────────────────────────────────── */
#preloader {
    position: fixed; inset: 0;
    z-index: var(--z-preloader);
    background: var(--color-bg-page);
    display: flex; align-items: center; justify-content: center;
    transition: opacity 0.6s ease, visibility 0.6s ease;
}
#preloader.hidden { opacity: 0; visibility: hidden; }
.loader-ring {
    width: 80px; height: 80px; border-radius: 50%;
    border: 3px solid transparent;
    border-top-color: var(--color-primary);
    border-bottom-color: var(--color-primary-light);
    animation: spin 1s linear infinite;
}

/* ─── KEYFRAMES ────────────────────────────────────────────── */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes slide-up {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes slide-right {
    from { opacity: 0; transform: translateX(-24px); }
    to { opacity: 1; transform: translateX(0); }
}
@keyframes blink { 50% { opacity: 0; } }

/* ─── CARDS (Elevation-based) ──────────────────────────────── */
.glass {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}
.glass-bright {
    background: var(--color-bg-section);
    border: 1px solid var(--color-border);
}

/* ─── GRADIENT TEXT ─────────────────────────────────────────── */
.gradient-text {
    background: linear-gradient(135deg, var(--color-primary), #0ea5e9);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ─── BUTTONS ──────────────────────────────────────────────── */
.magnetic-btn {
    position: relative; overflow: hidden;
    transition: all var(--duration-normal) ease;
}
.magnetic-btn span { position: relative; z-index: 1; }

.btn-cta {
    background: var(--color-cta);
    color: #fff;
    transition: background var(--duration-normal) ease, transform var(--duration-fast) ease;
    cursor: pointer;
}
.btn-cta:hover { background: var(--color-cta-hover); }
.btn-cta:active { transform: scale(0.98); }

.btn-outline {
    border: 1.5px solid var(--color-border);
    color: var(--color-text-body);
    transition: border-color var(--duration-normal) ease, color var(--duration-normal) ease;
    cursor: pointer;
}
.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* ─── REVEAL ANIMATIONS ────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(16px); transition: all 0.5s var(--ease-out); }
.reveal.active { opacity: 1; transform: translateY(0); }
.reveal-left { opacity: 0; transform: translateX(-16px); transition: all 0.5s var(--ease-out); }
.reveal-left.active { opacity: 1; transform: translateX(0); }
.reveal-right { opacity: 0; transform: translateX(16px); transition: all 0.5s var(--ease-out); }
.reveal-right.active { opacity: 1; transform: translateX(0); }
.reveal-scale { opacity: 0; transform: scale(0.97); transition: all 0.5s var(--ease-out); }
.reveal-scale.active { opacity: 1; transform: scale(1); }

/* ─── SERVICE CARD ─────────────────────────────────────────── */
.service-card {
    transition: all var(--duration-slow) var(--ease-out);
    cursor: default;
}
.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.service-card .icon-wrap { transition: transform var(--duration-normal) ease; }
.service-card:hover .icon-wrap { transform: scale(1.08); }
.service-card::after {
    content: ''; position: absolute; bottom: 0; left: 0;
    width: 100%; height: 3px; border-radius: 0 0 16px 16px;
    background: linear-gradient(90deg, var(--accent-from), var(--accent-to));
    transform: scaleX(0); transition: transform var(--duration-slow) ease;
}
.service-card:hover::after { transform: scaleX(1); }

/* ─── TEAM CARD ────────────────────────────────────────────── */
.team-card { perspective: 1000px; }
.team-card-inner { transition: all 0.5s var(--ease-out); }
.team-card:hover .team-card-inner {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}
.team-card .avatar-ring {
    border: 2px solid var(--color-primary);
    border-radius: 50%;
}

/* ─── NAVBAR ───────────────────────────────────────────────── */
.nav-scrolled {
    background: rgba(255,255,255,0.95) !important;
    backdrop-filter: blur(20px) !important;
    box-shadow: var(--shadow-md) !important;
    border-bottom: 1px solid var(--color-border) !important;
}

/* ─── MARQUEE ──────────────────────────────────────────────── */
.marquee-track {
    display: flex; gap: 4rem;
    animation: marquee 30s linear infinite;
}
@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ─── STATS ────────────────────────────────────────────────── */
.stat-number { font-variant-numeric: tabular-nums; }

/* ─── SCROLL PROGRESS ──────────────────────────────────────── */
.scroll-progress {
    position: fixed; top: 0; left: 0; height: 3px;
    z-index: var(--z-progress);
    background: linear-gradient(90deg, var(--color-primary), var(--color-cta));
    transition: width 0.1s linear;
}

/* ─── TYPE CURSOR ──────────────────────────────────────────── */
.type-cursor::after {
    content: '|'; animation: blink 1s step-end infinite;
    color: var(--color-primary); font-weight: 300;
}

/* ─── PROJECT MODAL ────────────────────────────────────────── */
body.modal-open { overflow: hidden; }

.project-modal-overlay {
    opacity: 0;
    transition: opacity 0.3s ease;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}
.project-modal-overlay.show { opacity: 1; }

.project-modal-content {
    transform: translateY(30px) scale(0.97);
    opacity: 0;
    transition: transform var(--duration-slow) var(--ease-out), opacity 0.3s ease;
}
.project-modal-overlay.show .project-modal-content {
    transform: translateY(0) scale(1);
    opacity: 1;
}

#modalAccent {
    background: linear-gradient(90deg, var(--color-primary), #0ea5e9);
}

.modal-tag {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: 9999px;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.05em;
}
.modal-section-title {
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-bottom: 0.75rem;
}
.modal-tool-card {
    background: var(--color-bg-section);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 14px 16px;
    transition: border-color var(--duration-normal) ease;
}
.modal-tool-card:hover {
    border-color: var(--color-primary-light);
}
.modal-feature-pill {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 99px;
    background: var(--color-bg-section);
    border: 1px solid var(--color-border);
    font-size: 11px;
    color: var(--color-text-body);
    font-family: var(--font-mono);
}

/* ─── PROJECT CARDS ────────────────────────────────────────── */
.project-card {
    transition: all var(--duration-slow) var(--ease-out);
    cursor: pointer;
}
.project-card:hover {
    transform: translateY(-3px);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-md);
}

/* ─── MODAL CLOSE ──────────────────────────────────────────── */
.modal-close-btn {
    background: var(--color-surface-hover);
    color: var(--color-text-muted);
    cursor: pointer;
}
.modal-close-btn:hover {
    background: #fee2e2;
    color: var(--color-error);
}

/* ─── FOOTER SOCIAL ────────────────────────────────────────── */
.footer-social { background: rgba(255,255,255,0.06); }
.footer-social:hover { background: rgba(96,165,250,0.15); color: #60a5fa; }

/* ─── FOOTER LINK HOVER (replaces inline event handlers) ──── */
.footer-link { color: #94A3B8; transition: color var(--duration-normal) ease; }
.footer-link:hover { color: #60a5fa; }

/* ─── TEAM SOCIAL ICONS ────────────────────────────────────── */
.team-social {
    background: var(--color-bg-section);
    color: var(--color-text-muted);
    transition: background var(--duration-normal) ease, color var(--duration-normal) ease;
}
.team-social:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* ─── FORM INPUT FOCUS (replaces inline event handlers) ────── */
.form-input {
    background: #fff;
    border: 1.5px solid var(--color-border);
    color: var(--color-text-heading);
    transition: border-color var(--duration-normal) ease, box-shadow var(--duration-normal) ease;
}
.form-input:focus {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-focus);
    outline: none;
}
.form-input::placeholder {
    color: var(--color-text-subtle);
}

/* ─── CONTACT INFO ICON ────────────────────────────────────── */
.contact-icon {
    color: var(--color-primary);
}

/* ─── prefers-reduced-motion (Accessibility — Critical) ────── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    .reveal, .reveal-left, .reveal-right, .reveal-scale {
        opacity: 1 !important;
        transform: none !important;
    }
    .marquee-track {
        animation: none !important;
    }
}

/* ─── RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 640px) {
    .project-modal-content { margin: 1rem 0; }
    .modal-tool-card { padding: 10px 12px; }
}

/* ─── CV VIEWER MODAL ──────────────────────────────────────── */
.cv-modal-overlay {
    opacity: 0;
    transition: opacity 0.3s ease;
}
.cv-modal-overlay.show { opacity: 1; }

.cv-frame {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
    transform-origin: top left;
}

.cv-toolbar-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.15);
    cursor: pointer;
    transition: background var(--duration-fast) ease, border-color var(--duration-fast) ease;
    touch-action: manipulation;
}
.cv-toolbar-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}
.cv-close-btn:hover {
    background: rgba(220, 38, 38, 0.6);
    border-color: rgba(220, 38, 38, 0.8);
}

/* ─── VIEW CV BUTTON (team cards) ──────────────────────────── */
.cv-view-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 9999px;
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    color: var(--color-primary);
    background: var(--color-primary-bg);
    border: 1px solid var(--color-primary-light);
    cursor: pointer;
    transition: background var(--duration-normal) ease, color var(--duration-normal) ease, border-color var(--duration-normal) ease;
    touch-action: manipulation;
}
.cv-view-btn:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.cv-view-btn-sm {
    padding: 4px 10px;
    font-size: 9px;
}

@media (max-width: 640px) {
    .cv-toolbar-btn { width: 28px; height: 28px; border-radius: 6px; }
    .cv-view-btn-sm { padding: 3px 8px; font-size: 8px; gap: 3px; }
    .cv-view-btn-sm i { font-size: 8px; }
}