/* ═══════════════════════════════════════════════════════════
   Day / Night themes — กลางวันสบายตา · กลางคืนมืด glass blur
   ═══════════════════════════════════════════════════════════ */

:root,
[data-theme="day"] {
    color-scheme: light;

    --bg-page: #FAF6F0;
    --bg-elevated: #FFFCF8;
    --bg-glass: rgba(255, 252, 248, 0.92);
    --glass-blur: 10px;

    --text-primary: #4A3728;
    --text-muted: #6B5344;
    --text-dim: #8B7355;
    --text-on-dark: #FFFCF8;
    --text-on-dark-muted: rgba(255, 252, 248, 0.78);

    --on-light: var(--text-primary);
    --on-light-muted: var(--text-muted);
    --on-light-dim: var(--text-dim);
    --on-dark: var(--text-on-dark);
    --on-dark-muted: var(--text-on-dark-muted);

    --cream: #F5EDE3;
    --warm-white: #FFFCF8;
    --cool-light: #FAF6F0;
    --stone: #EDE4D8;
    --card-light: #FFFCF8;
    --card-light-border: rgba(201, 162, 39, 0.28);
    --card-light-shadow: 0 6px 24px rgba(92, 64, 51, 0.08);

    --header-bg: rgba(61, 43, 31, 0.45);
    --header-border: rgba(201, 162, 39, 0.2);
    --header-link: rgba(255, 252, 248, 0.9);
    --header-logo: #FFFCF8;
    --header-scrolled-bg: rgba(255, 252, 248, 0.96);
    --header-scrolled-link: var(--text-muted);
    --header-scrolled-logo: var(--text-primary);

    --trust-bg: linear-gradient(180deg, #F5EDE3 0%, #FAF6F0 100%);
    --trust-inner-bg: #FFFCF8;
    --services-bg: linear-gradient(180deg, #FFFCF8 0%, #FAF6F0 100%);
    --process-bg: linear-gradient(180deg, #FAF6F0 0%, #F5EDE3 100%);
    --why-bg: linear-gradient(180deg, #FFFCF8 0%, #FAF6F0 100%);
    --contact-bg: linear-gradient(180deg, #FAF6F0 0%, #F5EDE3 100%);
    --portfolio-bg: linear-gradient(165deg, #5C4033 0%, #4A3728 100%);
    --tech-bg: linear-gradient(180deg, #4A3728 0%, #3D2B1F 100%);
    --footer-bg: #3D2B1F;
    --footer-text: rgba(255, 252, 248, 0.78);
    --footer-heading: #FFFCF8;
    --footer-border: rgba(255, 255, 255, 0.08);

    --about-v2-bg: linear-gradient(180deg, #FFFCF8 0%, #FAF6F0 50%, #F5EDE3 100%);
    --about-values-bg: #FFFCF8;
    --about-value-bg: #FAF6F0;

    --grain-opacity: 0.01;
    --ambient-display: none;
    --theme-transition: background-color 0.45s ease, color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

[data-theme="night"] {
    color-scheme: dark;

    --bg-page: #2A1F18;
    --bg-elevated: rgba(61, 43, 31, 0.85);
    --bg-glass: rgba(255, 252, 248, 0.06);
    --glass-blur: 22px;

    --text-primary: #FFFCF8;
    --text-muted: rgba(245, 237, 227, 0.72);
    --text-dim: rgba(139, 115, 85, 0.85);
    --text-on-dark: #FFFCF8;
    --text-on-dark-muted: rgba(255, 252, 248, 0.72);

    --on-light: var(--text-primary);
    --on-light-muted: var(--text-muted);
    --on-light-dim: var(--text-dim);
    --on-dark: var(--text-on-dark);
    --on-dark-muted: var(--text-on-dark-muted);

    --cream: rgba(201, 162, 39, 0.1);
    --warm-white: rgba(255, 252, 248, 0.05);
    --cool-light: rgba(255, 252, 248, 0.04);
    --stone: #2A1F18;
    --card-light: rgba(255, 252, 248, 0.06);
    --card-light-border: rgba(201, 162, 39, 0.22);
    --card-light-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);

    --header-bg: rgba(42, 31, 24, 0.75);
    --header-border: rgba(201, 162, 39, 0.15);
    --header-link: rgba(255, 252, 248, 0.85);
    --header-logo: #FFFCF8;
    --header-scrolled-bg: rgba(42, 31, 24, 0.92);
    --header-scrolled-link: var(--text-muted);
    --header-scrolled-logo: var(--text-primary);

    --trust-bg: transparent;
    --trust-inner-bg: rgba(255, 252, 248, 0.05);
    --services-bg: transparent;
    --process-bg: transparent;
    --why-bg: transparent;
    --contact-bg: transparent;
    --portfolio-bg: transparent;
    --tech-bg: transparent;
    --footer-bg: #2A1E16;
    --footer-text: rgba(255, 252, 248, 0.72);
    --footer-heading: #FFFCF8;
    --footer-border: rgba(255, 255, 255, 0.06);

    --about-v2-bg: linear-gradient(180deg, #2A1F18 0%, #3D2B1F 50%, #2A1F18 100%);
    --about-values-bg: rgba(255, 252, 248, 0.05);
    --about-value-bg: rgba(255, 252, 248, 0.04);

    --grain-opacity: 0.02;
    --ambient-display: block;
}

/* ── Base ── */
body {
    background: var(--bg-page);
    color: var(--text-primary);
    transition: var(--theme-transition);
}

body::before {
    opacity: var(--grain-opacity);
}

body::after {
    content: '';
    display: var(--ambient-display);
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background:
        radial-gradient(ellipse 55% 45% at 12% 18%, rgba(201, 162, 39, 0.1), transparent 55%),
        radial-gradient(ellipse 50% 40% at 88% 72%, rgba(92, 64, 51, 0.12), transparent 50%);
    filter: blur(40px);
}

body > * {
    position: relative;
    z-index: 1;
}

/* ── Header ── */
.header {
    background: var(--header-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom-color: var(--header-border);
    transition: var(--theme-transition);
}
.header .nav-link { color: var(--header-link); }
.header .logo-text { color: var(--header-logo); }
.header .menu-toggle span { background: var(--header-logo); }
.header .lang-switch {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.12);
}

.header.scrolled {
    background: var(--header-scrolled-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-bottom-color: var(--card-light-border);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
}
.header.scrolled .nav-link { color: var(--header-scrolled-link); }
.header.scrolled .nav-link:hover,
.header.scrolled .nav-link.active { color: var(--gold-light); }
.header.scrolled .logo-text { color: var(--header-scrolled-logo); }
.header.scrolled .menu-toggle span { background: var(--header-scrolled-logo); }
.header.scrolled .lang-switch {
    background: var(--cream);
    border-color: var(--card-light-border);
}

[data-theme="day"] .header.scrolled .nav-link:hover,
[data-theme="day"] .header.scrolled .nav-link.active { color: var(--gold-dark); }

/* ── Theme toggle ── */
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.08);
    color: var(--gold-light);
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
}
.theme-toggle:hover {
    background: rgba(212, 175, 55, 0.18);
    border-color: rgba(212, 175, 55, 0.35);
    transform: scale(1.04);
}
.theme-toggle svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
    stroke-width: 1.75;
    stroke-linecap: round;
    stroke-linejoin: round;
}
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
[data-theme="night"] .theme-toggle .icon-sun { display: block; }
[data-theme="night"] .theme-toggle .icon-moon { display: none; }

.header.scrolled .theme-toggle {
    border-color: var(--card-light-border);
    background: var(--cream);
    color: var(--gold-dark);
}
[data-theme="night"] .header.scrolled .theme-toggle {
    color: var(--gold-light);
}

/* ── Sections ── */
.trust-strip { background: var(--trust-bg); }
.trust-inner {
    background: var(--trust-inner-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-color: var(--card-light-border);
    transition: var(--theme-transition);
}
.trust-label { color: var(--gold-dark); }
[data-theme="night"] .trust-label { color: var(--gold-light); }
.trust-tags span {
    color: var(--text-muted);
    background: var(--cream);
    border-color: var(--card-light-border);
}

.services { background: var(--services-bg); }
.process { background: var(--process-bg); }
.why { background: var(--why-bg); }
.contact { background: var(--contact-bg); }
.portfolio { background: var(--portfolio-bg); }
.tech { background: var(--tech-bg); }
.footer { background: var(--footer-bg); }

[data-theme="night"] .services,
[data-theme="night"] .process,
[data-theme="night"] .why,
[data-theme="night"] .contact {
    background: transparent;
}

[data-theme="night"] .portfolio {
    background: linear-gradient(165deg, rgba(74, 55, 40, 0.95) 0%, rgba(42, 31, 24, 0.98) 100%);
}
[data-theme="night"] .tech {
    background: linear-gradient(180deg, rgba(61, 43, 31, 0.95) 0%, rgba(42, 31, 24, 0.98) 100%);
}

/* Section headers */
.section-header h2,
.section-header--compact h2 { color: var(--text-primary); }
.section-header p,
.section-header--compact p { color: var(--text-muted); }
.services .section-header--compact h2,
.process .section-header--compact h2,
.why .section-header--compact h2,
.contact .section-header--compact h2 { color: var(--text-primary); }
.portfolio .section-header--compact h2,
.tech .section-header--compact h2 { color: var(--text-on-dark); }
.portfolio .section-header--compact p,
.tech .section-header--compact p { color: var(--text-on-dark-muted); }

/* Cards — glass in night */
[data-theme="night"] .service-tabs,
[data-theme="night"] .service-card,
[data-theme="night"] .process-step,
[data-theme="night"] .why-card,
[data-theme="night"] .contact-item,
[data-theme="night"] .contact-form,
[data-theme="night"] .portfolio-card {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-color: var(--card-light-border);
    box-shadow: var(--card-light-shadow);
}

[data-theme="night"] .service-card h3,
[data-theme="night"] .process-step h4,
[data-theme="night"] .why-card h4,
[data-theme="night"] .contact-item strong,
[data-theme="night"] .form-group label { color: var(--text-primary); }

[data-theme="night"] .service-card p,
[data-theme="night"] .process-step p,
[data-theme="night"] .why-card p,
[data-theme="night"] .contact-item p { color: var(--text-muted); }

[data-theme="night"] .service-card--featured {
    background: rgba(212, 175, 55, 0.08);
}

[data-theme="night"] .tab-btn { color: var(--text-muted); }
[data-theme="night"] .tab-btn .pct {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-dim);
}
[data-theme="night"] .tab-btn:not(.active):hover {
    background: rgba(212, 175, 55, 0.1);
    color: var(--gold-light);
}

[data-theme="night"] .service-watermark { color: rgba(255, 255, 255, 0.04); }

[data-theme="night"] .form-group input,
[data-theme="night"] .form-group textarea {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}
[data-theme="night"] .form-group input:focus,
[data-theme="night"] .form-group textarea:focus {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--gold);
}

[data-theme="night"] .map-placeholder {
    background: rgba(255, 255, 255, 0.04);
    border-color: var(--card-light-border);
    color: var(--text-dim);
}

[data-theme="night"] .portfolio-info h3 { color: var(--text-on-dark); }
[data-theme="night"] .portfolio-info p { color: var(--text-on-dark-muted); }

/* Stats */
[data-theme="night"] .stats-grid {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-color: rgba(212, 175, 55, 0.2);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* Hero — night softer overlay */
[data-theme="night"] .hero-overlay {
    background: linear-gradient(108deg,
        rgba(42, 31, 24, 0.92) 0%,
        rgba(42, 31, 24, 0.72) 50%,
        rgba(42, 31, 24, 0.45) 100%) !important;
}

[data-theme="day"] .hero-overlay {
    background: linear-gradient(108deg,
        rgba(61, 43, 31, 0.88) 0%,
        rgba(74, 55, 40, 0.6) 50%,
        rgba(92, 64, 51, 0.35) 100%) !important;
}

/* About v2 */
.about-v2-bg {
    background: var(--about-v2-bg);
    transition: var(--theme-transition);
}
[data-theme="night"] .about-v2-bg::before {
    background:
        radial-gradient(ellipse 70% 50% at 15% 10%, rgba(212, 175, 55, 0.1), transparent 55%),
        radial-gradient(ellipse 55% 45% at 85% 90%, rgba(90, 120, 180, 0.08), transparent 50%);
}
[data-theme="night"] .about-v2-bg::after { opacity: 0.03; }

.about-values {
    background: var(--about-values-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-color: var(--card-light-border);
    transition: var(--theme-transition);
}
.about-values-head h3 { color: var(--text-primary); }
[data-theme="night"] .about-values-head .section-tag { color: var(--gold-light); }

.about-value {
    background: var(--about-value-bg);
    border-color: var(--card-light-border);
}
[data-theme="night"] .about-value:hover {
    background: rgba(255, 255, 255, 0.08);
}
.about-value h4 { color: var(--text-primary); }
.about-value p { color: var(--text-muted); }

[data-theme="night"] .about-duo-card {
    background: rgba(255, 252, 248, 0.07);
    border-color: rgba(201, 162, 39, 0.35);
    backdrop-filter: blur(var(--glass-blur));
}
[data-theme="night"] .about-duo-card h3 { color: #FFFCF8; }
[data-theme="night"] .about-duo-card p { color: rgba(245, 237, 227, 0.82); }
[data-theme="night"] .about-duo-num { color: #E8D48B; }
[data-theme="night"] .about-values-head h3,
[data-theme="night"] .about-value h4 { color: #FFFCF8; }
[data-theme="night"] .about-value p { color: var(--text-muted); }

[data-theme="day"] .about-feature {
    box-shadow: 0 8px 32px rgba(61, 43, 31, 0.16);
}

[data-theme="night"] .about-feature {
    background: linear-gradient(145deg, #3D2B1F 0%, #2A1E16 100%);
    border-color: rgba(201, 162, 39, 0.22);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}

/* CTA night */
[data-theme="night"] .cta--photo::before {
    background: linear-gradient(135deg, rgba(8, 10, 16, 0.92), rgba(14, 18, 26, 0.78)) !important;
}

[data-theme="night"] .tech-badge {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(212, 175, 55, 0.18);
    backdrop-filter: blur(12px);
}

[data-theme="day"] .service-card {
    background: rgba(252, 251, 248, 0.95);
    border-color: var(--card-light-border);
}
[data-theme="day"] .service-tabs {
    background: var(--bg-glass);
    backdrop-filter: blur(var(--glass-blur));
}
[data-theme="day"] .process-step,
[data-theme="day"] .why-card,
[data-theme="day"] .contact-item,
[data-theme="day"] .contact-form {
    background: var(--card-light);
    border-color: var(--card-light-border);
}

.stat-label { color: inherit; }
[data-theme="day"] .stats-grid { border-color: rgba(212, 175, 55, 0.18); }

@media (max-width: 768px) {
    [data-theme="day"] .nav {
        background: rgba(252, 251, 248, 0.97);
    }
    [data-theme="night"] .nav {
        background: rgba(14, 18, 26, 0.95);
        backdrop-filter: blur(var(--glass-blur));
        border-color: var(--card-light-border);
    }
    [data-theme="night"] .nav-link { color: var(--text-muted); }
}