/* ══════════════════════════════════════════════
   E&P Digital Service — Premium Design System
   Font: Inter · Palette: Indigo + Warm Neutrals
   Dark/Light Mode
══════════════════════════════════════════════ */

/* ────── LIGHT MODE (default) ────── */
:root {
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --primary-100: #c7d2fe;
    --primary-glow: rgba(79, 70, 229, .18);
    --accent: #7c3aed;
    --accent-light: #ede9fe;

    --bg: #ffffff;
    --bg-alt: #fafafa;
    --surface: #ffffff;
    --surface-hover: #f4f4f5;
    --border: #e4e4e7;
    --border-light: #f4f4f5;

    --text: #18181b;
    --text-secondary: #52525b;
    --text-muted: #71717a;
    --text-faint: #a1a1aa;
    --text-invert: #ffffff;

    --card-bg: #ffffff;
    --card-border: #e4e4e7;
    --card-hover-shadow: 0 12px 32px rgba(0,0,0,.08);

    --nav-bg: rgba(255,255,255,.88);
    --nav-border: #e4e4e7;
    --nav-scroll-bg: rgba(255,255,255,.96);

    --input-bg: #ffffff;
    --input-border: #e4e4e7;

    --cta-bg: linear-gradient(135deg, #18181b 0%, #1e1b4b 100%);
    --cta-text: #ffffff;
    --cta-sub: #a1a1aa;

    --footer-bg: #ffffff;

    --thumb-bg: linear-gradient(135deg, var(--primary-light), var(--accent-light));

    --radius: 16px;
    --radius-sm: 12px;
    --radius-xs: 8px;

    --shadow-xs: 0 1px 2px rgba(0,0,0,.04);
    --shadow-sm: 0 2px 8px rgba(0,0,0,.05);
    --shadow-md: 0 6px 20px rgba(0,0,0,.06);
    --shadow-lg: 0 12px 32px rgba(0,0,0,.08);
    --shadow-xl: 0 20px 50px rgba(0,0,0,.12);
    --shadow-glow: 0 8px 28px var(--primary-glow);

    --ease: cubic-bezier(.4,0,.2,1);
}

/* ────── DARK MODE ────── */
[data-theme="dark"] {
    --primary: #818cf8;
    --primary-hover: #6366f1;
    --primary-light: rgba(99, 102, 241, .12);
    --primary-100: rgba(99, 102, 241, .2);
    --primary-glow: rgba(129, 140, 248, .2);
    --accent: #a78bfa;
    --accent-light: rgba(167, 139, 250, .1);

    --bg: #0c0a1a;
    --bg-alt: #110f24;
    --surface: #16132e;
    --surface-hover: #1e1a3a;
    --border: #2a2545;
    --border-light: #1e1a3a;

    --text: #f0eef8;
    --text-secondary: #c4c0d8;
    --text-muted: #918daa;
    --text-faint: #6b6782;
    --text-invert: #0c0a1a;

    --card-bg: #16132e;
    --card-border: #2a2545;
    --card-hover-shadow: 0 12px 40px rgba(0,0,0,.35);

    --nav-bg: rgba(12, 10, 26, .85);
    --nav-border: #2a2545;
    --nav-scroll-bg: rgba(12, 10, 26, .95);

    --input-bg: #1e1a3a;
    --input-border: #2a2545;

    --cta-bg: linear-gradient(135deg, #1e1a3a 0%, #1a1145 100%);
    --cta-text: #f0eef8;
    --cta-sub: #918daa;

    --footer-bg: #0c0a1a;

    --thumb-bg: linear-gradient(135deg, rgba(79,70,229,.15), rgba(124,58,237,.1));
}

/* ── Reset ── */
*,*::before,*::after { margin:0;padding:0;box-sizing:border-box }
html { scroll-behavior:smooth }
body {
    font-family:'Inter',system-ui,-apple-system,sans-serif;
    background:var(--bg);color:var(--text-secondary);
    line-height:1.65;overflow-x:hidden;
    -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
    transition:background .4s var(--ease), color .4s var(--ease);
}
a { text-decoration:none;color:inherit;transition:all .25s var(--ease) }
ul { list-style:none }
img { max-width:100%;display:block }
button { font-family:inherit }
.container { max-width:1180px;margin:0 auto;padding:0 24px }

/* Particle Canvas */
.particles-canvas {
    position:fixed;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:0;
}

/* ── Typography ── */
h1,h2,h3,h4 { color:var(--text);font-weight:800;line-height:1.15;transition:color .3s var(--ease) }
h1 { font-size:clamp(2.5rem,5.5vw,3.75rem);letter-spacing:-.04em }
h2 { font-size:clamp(1.75rem,3.5vw,2.5rem);letter-spacing:-.03em }
.gradient-text {
    background:linear-gradient(135deg,var(--primary) 0%,var(--accent) 50%,#a78bfa 100%);
    -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}

/* ── Buttons ── */
.btn {
    display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
    padding:.7rem 1.5rem;border-radius:var(--radius-xs);font-weight:600;font-size:.9rem;
    border:1.5px solid transparent;cursor:pointer;transition:all .25s var(--ease);white-space:nowrap;
}
.btn-primary { background:var(--primary);color:var(--text-invert);border-color:var(--primary) }
.btn-primary:hover { background:var(--primary-hover);border-color:var(--primary-hover);transform:translateY(-2px);box-shadow:var(--shadow-glow) }
[data-theme="dark"] .btn-primary { color:#fff }
.btn-hero { padding:.85rem 2rem;font-size:1rem;border-radius:var(--radius-sm) }
.btn-ghost { background:transparent;color:var(--text);font-weight:600;padding:.7rem .5rem }
.btn-ghost:hover { color:var(--primary) }
.btn-ghost i { transition:transform .25s }
.btn-ghost:hover i { transform:translateX(4px) }
.btn-outline-card { background:transparent;border-color:var(--border);color:var(--text);width:100% }
.btn-outline-card:hover { border-color:var(--primary);color:var(--primary);background:var(--primary-light) }
.btn-cta { background:#fff;color:#18181b;font-weight:700;padding:.85rem 2rem;border-radius:var(--radius-sm) }
.btn-cta:hover { background:transparent;color:#fff;border-color:rgba(255,255,255,.5) }
.full-btn { width:100% }
.btn-nav { padding:.55rem 1.25rem;font-size:.85rem }

/* ── Theme Toggle ── */
.theme-toggle {
    width:36px;height:36px;border-radius:50%;border:1px solid var(--border);
    background:var(--surface);color:var(--text-muted);cursor:pointer;
    display:flex;align-items:center;justify-content:center;font-size:.9rem;
    transition:all .3s var(--ease);
}
.theme-toggle:hover { border-color:var(--primary);color:var(--primary);transform:rotate(20deg) }

/* ════════════════════
       NAVBAR
════════════════════ */
.navbar {
    position:fixed;top:0;left:0;width:100%;z-index:1000;
    background:var(--nav-bg);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
    border-bottom:1px solid var(--nav-border);padding:.85rem 0;transition:all .3s var(--ease);
}
.navbar.scrolled { background:var(--nav-scroll-bg);box-shadow:var(--shadow-xs) }
.nav-container { display:flex;justify-content:space-between;align-items:center;gap:.75rem }
.logo { display:flex;align-items:center;gap:.55rem;font-size:1rem;font-weight:800;color:var(--text);letter-spacing:-.02em }
.logo img { width:28px;height:28px;border-radius:var(--radius-xs);object-fit:cover }
.nav-links { display:flex;gap:2rem;margin-right:auto;margin-left:2rem }
.nav-links a { font-weight:500;font-size:.88rem;color:var(--text-muted);position:relative }
.nav-links a::after { content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--primary);border-radius:2px;transition:width .25s var(--ease) }
.nav-links a:hover,.nav-links a.active-link { color:var(--text) }
.nav-links a:hover::after,.nav-links a.active-link::after { width:100% }

.mobile-toggle { display:none;background:none;border:none;width:26px;height:18px;position:relative;cursor:pointer }
.mobile-toggle span { display:block;width:100%;height:2px;background:var(--text);border-radius:2px;position:absolute;left:0;transition:all .3s var(--ease) }
.mobile-toggle span:nth-child(1) { top:0 }
.mobile-toggle span:nth-child(2) { top:50%;transform:translateY(-50%) }
.mobile-toggle span:nth-child(3) { bottom:0 }
.mobile-toggle.active span:nth-child(1) { top:50%;transform:translateY(-50%) rotate(45deg) }
.mobile-toggle.active span:nth-child(2) { opacity:0 }
.mobile-toggle.active span:nth-child(3) { bottom:50%;transform:translateY(50%) rotate(-45deg) }

/* ════════════════════
        HERO
════════════════════ */
.hero { padding:160px 0 100px;position:relative }
.hero-grid { display:grid;grid-template-columns:1fr 1fr;gap:5rem;align-items:center;position:relative;z-index:1 }
.hero-desc { font-size:1.1rem;margin:1.25rem 0 2rem;max-width:480px;line-height:1.75;color:var(--text-muted) }
.hero-actions { display:flex;gap:.75rem;flex-wrap:wrap }

.feature-grid { display:grid;grid-template-columns:1fr 1fr;gap:.65rem }
.f-card {
    background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius);
    padding:1.75rem 1.35rem;transition:all .3s var(--ease);
}
.f-card:hover { border-color:var(--text-faint);box-shadow:var(--shadow-sm);transform:translateY(-3px) }
.f-icon {
    width:38px;height:38px;border-radius:var(--radius-xs);display:flex;
    align-items:center;justify-content:center;font-size:1rem;margin-bottom:.85rem;
}
.f-icon.blue { background:var(--primary-light);color:var(--primary) }
.f-icon.purple { background:var(--accent-light);color:var(--accent) }
.f-icon.green { background:rgba(5,150,105,.1);color:#34d399 }
.f-icon.white { background:rgba(255,255,255,.12);color:#fff }
.f-card h4 { font-size:.9rem;margin-bottom:.15rem;font-weight:700 }
.f-card p { font-size:.78rem;color:var(--text-faint) }
.f-card.dark { background:var(--surface);border-color:var(--border) }
[data-theme="dark"] .f-card.dark { background:#1a1640;border-color:#2a2555 }
.f-card.dark h4 { color:#fff }
.f-card.dark p { color:var(--text-faint) }
.f-card.dark:hover { border-color:var(--text-muted) }

/* ════════════════════
       SECTIONS
════════════════════ */
.section { padding:100px 0 }
.section-alt { background:var(--bg-alt);border-top:1px solid var(--border);border-bottom:1px solid var(--border) }
.sec-head { margin-bottom:3.5rem }
.sec-head.center { text-align:center }
.sec-head.center .sec-sub { margin-left:auto;margin-right:auto }
.label { display:inline-block;font-size:.72rem;text-transform:uppercase;letter-spacing:.13em;font-weight:700;color:var(--primary);margin-bottom:.65rem }
.sec-sub { font-size:1rem;color:var(--text-muted);max-width:500px;margin-top:.5rem }
.sec-head-row { display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:2.5rem;flex-wrap:wrap;gap:1rem }

/* ── Services ── */
.services-grid { display:grid;grid-template-columns:repeat(4,1fr);gap:.85rem }
.svc {
    background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius);
    padding:1.65rem 1.4rem;transition:all .3s var(--ease);position:relative;overflow:hidden;
}
.svc::before {
    content:'';position:absolute;top:0;left:0;width:100%;height:3px;
    background:linear-gradient(90deg,var(--primary),var(--accent));transform:scaleX(0);transform-origin:left;transition:transform .4s var(--ease);
}
.svc:hover::before { transform:scaleX(1) }
.svc:hover { box-shadow:var(--card-hover-shadow);transform:translateY(-4px) }
.svc-highlight { border-color:var(--primary);background:var(--primary-light) }
.svc-icon {
    width:40px;height:40px;border-radius:var(--radius-xs);background:var(--surface-hover);
    border:1px solid var(--border);color:var(--text);display:flex;
    align-items:center;justify-content:center;font-size:1.1rem;margin-bottom:1rem;
    transition:all .3s var(--ease);
}
.svc:hover .svc-icon { background:var(--primary);color:#fff;border-color:var(--primary) }
.svc-icon-inv { background:var(--primary);color:#fff;border-color:var(--primary) }
.svc h3 { font-size:.95rem;margin-bottom:.35rem;font-weight:700 }
.svc p { font-size:.82rem;color:var(--text-muted);line-height:1.55 }

/* ── Pricing ── */
.pricing-row { display:grid;grid-template-columns:repeat(4,1fr);gap:1.1rem;align-items:start }
.p-card {
    background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius);
    padding:2rem 1.65rem;position:relative;transition:all .35s var(--ease);display:flex;flex-direction:column;
}
.p-card:hover { box-shadow:var(--card-hover-shadow);transform:translateY(-6px) }
.p-popular { border-color:var(--primary);box-shadow:var(--shadow-md) }
.p-popular:hover { box-shadow:var(--shadow-xl) }
.pop-tag {
    position:absolute;top:0;left:50%;transform:translate(-50%,-50%);
    background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-size:.65rem;font-weight:700;
    padding:.3rem 1rem;border-radius:50px;text-transform:uppercase;letter-spacing:.08em;
}
.p-badge-icon {
    width:42px;height:42px;border-radius:var(--radius-xs);background:var(--primary-light);
    color:var(--primary);display:flex;align-items:center;justify-content:center;
    font-size:1.15rem;margin-bottom:.85rem;
}
.p-card h3 { font-size:1.25rem;margin-bottom:.2rem }
.p-desc { font-size:.82rem;color:var(--text-muted);margin-bottom:1.5rem;min-height:36px }
.p-price {
    font-size:2rem;font-weight:900;color:var(--text);letter-spacing:-.03em;
    margin-bottom:1.5rem;padding-bottom:1.5rem;border-bottom:1px solid var(--border);
}
.p-price small { font-size:.9rem;color:var(--text-faint);font-weight:500 }
.p-list { margin-bottom:1.75rem;flex-grow:1 }
.p-list li { display:flex;align-items:center;gap:.6rem;font-size:.85rem;margin-bottom:.65rem;color:var(--text-secondary) }
.p-list li i { color:var(--primary);font-size:.7rem;flex-shrink:0 }
.p-list li.off { color:var(--text-faint);opacity:.45 }
.p-list li.off i { color:var(--text-faint) }

/* ── Portfolio ── */
.portfolio-grid { display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem }
.portfolio-grid-full { grid-template-columns:repeat(auto-fill,minmax(300px,1fr)) }
.portfolio-card {
    background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius);
    overflow:hidden;transition:all .35s var(--ease);
}
.portfolio-card:hover { box-shadow:var(--card-hover-shadow);transform:translateY(-6px);border-color:var(--text-faint) }
.portfolio-thumb { width:100%;height:200px;object-fit:cover;border-bottom:1px solid var(--border) }
.portfolio-thumb-placeholder {
    width:100%;height:200px;background:var(--thumb-bg);
    display:flex;align-items:center;justify-content:center;color:var(--primary);font-size:2.5rem;
    border-bottom:1px solid var(--border);
}
.portfolio-info { padding:1.35rem }
.portfolio-info .category { font-size:.68rem;text-transform:uppercase;letter-spacing:.1em;font-weight:700;color:var(--primary);margin-bottom:.4rem }
.portfolio-info h3 { font-size:1rem;margin-bottom:.35rem }
.portfolio-info p { font-size:.82rem;color:var(--text-muted);margin-bottom:.85rem;line-height:1.55 }
.portfolio-info .link-row { display:flex;align-items:center;gap:.35rem;font-size:.82rem;font-weight:600;color:var(--primary) }
.portfolio-info .link-row i { font-size:.65rem;transition:transform .25s }
.portfolio-card:hover .link-row i { transform:translateX(4px) }
.portfolio-loading { grid-column:1/-1;text-align:center;padding:3.5rem 0;color:var(--text-faint) }
.portfolio-loading i { font-size:1.75rem;display:block;margin-bottom:.65rem;color:var(--primary) }
.portfolio-empty { grid-column:1/-1;text-align:center;padding:3.5rem 2rem;background:var(--bg-alt);border-radius:var(--radius);border:1px dashed var(--border) }
.portfolio-empty i { font-size:2rem;color:var(--text-faint);display:block;margin-bottom:.65rem }

/* ── Page Header (portfolio.html) ── */
.page-header {
    padding:140px 0 40px;
    border-bottom:1px solid var(--border);background:var(--bg-alt);
}
.page-header h1 { font-size:clamp(1.75rem,3vw,2.25rem);margin-bottom:.4rem }
.page-header p { font-size:1rem;color:var(--text-muted) }
.back-link { display:inline-flex;align-items:center;gap:.4rem;font-size:.85rem;font-weight:600;color:var(--text-muted);margin-bottom:1rem }
.back-link:hover { color:var(--primary) }
.back-link:hover i { transform:translateX(-3px) }
.back-link i { transition:transform .2s }

/* ── FAQ ── */
.faq-layout { display:grid;grid-template-columns:.75fr 1.25fr;gap:5rem;align-items:start }
.faq-left p { margin-top:.65rem;font-size:.95rem;color:var(--text-muted);max-width:300px;line-height:1.65 }
.faq-item { border:1px solid var(--card-border);border-radius:var(--radius-sm);margin-bottom:.55rem;overflow:hidden;transition:all .25s var(--ease);background:var(--card-bg) }
.faq-item:hover { border-color:var(--text-faint) }
.faq-item.active { border-color:var(--primary);box-shadow:0 2px 12px var(--primary-glow) }
.faq-q {
    width:100%;display:flex;justify-content:space-between;align-items:center;
    padding:1.1rem 1.35rem;background:none;border:none;cursor:pointer;text-align:left;
    font-size:.9rem;font-weight:600;color:var(--text);
}
.faq-q i { font-size:.65rem;color:var(--text-faint);transition:transform .3s var(--ease);flex-shrink:0;margin-left:1rem }
.faq-item.active .faq-q i { transform:rotate(45deg);color:var(--primary) }
.faq-a { max-height:0;overflow:hidden;transition:max-height .35s var(--ease),padding .35s var(--ease);padding:0 1.35rem }
.faq-item.active .faq-a { max-height:250px;padding:0 1.35rem 1.1rem }
.faq-a p { font-size:.85rem;color:var(--text-muted);line-height:1.7 }

/* ── CTA ── */
.cta-section { padding:80px 0 }
.cta-box {
    background:var(--cta-bg);
    border-radius:var(--radius);padding:5rem 3rem;text-align:center;
    position:relative;overflow:hidden;border:1px solid var(--border);
}
.cta-box::before {
    content:'';position:absolute;width:600px;height:600px;
    background:radial-gradient(circle,rgba(79,70,229,.2),transparent 70%);
    top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:none;
}
.cta-box::after {
    content:'';position:absolute;width:400px;height:400px;
    background:radial-gradient(circle,rgba(124,58,237,.12),transparent 70%);
    top:20%;right:10%;pointer-events:none;
}
.cta-box h2 { color:var(--cta-text);margin-bottom:.65rem;position:relative;z-index:1 }
.cta-box p { color:var(--cta-sub);font-size:1rem;margin-bottom:2.5rem;max-width:460px;margin-left:auto;margin-right:auto;position:relative;z-index:1 }
.cta-box .btn { position:relative;z-index:1 }

/* ── Footer ── */
footer { border-top:1px solid var(--border);padding-top:80px;background:var(--footer-bg);transition:background .3s var(--ease) }
.footer-top { display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:2.5rem;margin-bottom:2.5rem }
.ft-brand p { margin:1rem 0;font-size:.85rem;max-width:260px;line-height:1.7 }
.socials { display:flex;gap:.5rem }
.socials a {
    width:34px;height:34px;border-radius:var(--radius-xs);background:var(--surface-hover);
    border:1px solid var(--border);display:flex;align-items:center;justify-content:center;
    color:var(--text-secondary);transition:all .25s var(--ease);font-size:.85rem;
}
.socials a:hover { background:var(--primary);color:#fff;border-color:var(--primary);transform:translateY(-2px) }
.ft-links h4 { font-size:.85rem;font-weight:700;margin-bottom:1.1rem;color:var(--text) }
.ft-links ul { display:flex;flex-direction:column;gap:.55rem }
.ft-links a { color:var(--text-faint);font-size:.82rem;display:flex;align-items:center;gap:.4rem }
.ft-links a:hover { color:var(--primary) }
.ft-links a i { font-size:.82rem;width:14px }
.ft-bottom { border-top:1px solid var(--border);padding:1.25rem 0;text-align:center;font-size:.8rem;color:var(--text-faint) }

/* ════════════════════
      ANIMATIONS
════════════════════ */
.fade-up { opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease),transform .6s var(--ease) }
.fade-in { opacity:0;transition:opacity .8s var(--ease) }
.fade-up.visible,.fade-in.visible { opacity:1;transform:translateY(0) }
.d1{transition-delay:.08s}.d2{transition-delay:.14s}.d3{transition-delay:.2s}.d4{transition-delay:.26s}
.reveal { opacity:0;transform:translateY(16px);transition:all .5s var(--ease) }
.reveal.active { opacity:1;transform:translateY(0) }

/* ════════════════════
      RESPONSIVE
════════════════════ */
@media(max-width:1100px){
    .services-grid { grid-template-columns:repeat(2,1fr) }
    .pricing-row { grid-template-columns:repeat(2,1fr) }
    .footer-top { grid-template-columns:1fr 1fr }
}
@media(max-width:900px){
    .hero-grid { grid-template-columns:1fr;gap:3rem }
    .hero-text { max-width:540px }
    .faq-layout { grid-template-columns:1fr;gap:2.5rem }
    .portfolio-grid { grid-template-columns:1fr }
}
@media(max-width:768px){
    .nav-links,.btn-nav { display:none!important }
    .mobile-toggle { display:block }
    .nav-links.active {
        display:flex!important;flex-direction:column;position:absolute;top:100%;left:0;width:100%;
        background:var(--nav-scroll-bg);backdrop-filter:blur(20px);padding:1.25rem 24px;
        border-bottom:1px solid var(--border);gap:.85rem;text-align:center;box-shadow:var(--shadow-md);
    }
    .hero-actions { flex-direction:column;width:100% }
    .feature-grid { grid-template-columns:1fr 1fr }
    .services-grid { grid-template-columns:1fr }
    .pricing-row { grid-template-columns:1fr }
    .footer-top { grid-template-columns:1fr }
    .section { padding:80px 0 }
    .cta-box { padding:3rem 1.5rem }
}
@media(max-width:480px){
    .feature-grid { grid-template-columns:1fr }
}