/* ============================================================
   STONE DRUMS — Global System + Interactive Modules
   Design tokens come from theme.json; this file adds the
   component layer (buttons, sections, cards) and the three
   interactive modules (particle hero, flip cards, count-up).
   ============================================================ */

:root {
	--sd-obsidian: #0B0B0F;
	--sd-obsidian-soft: #15151C;
	--sd-ink: #1E1E27;
	--sd-gold: #E96318;
	--sd-gold-bright: #FF8A3D;
	--sd-mist: #A8A8B3;
	--sd-cloud: #EDEDF2;
	--sd-white: #FFFFFF;
	--sd-radius: 18px;
	--sd-radius-pill: 999px;
	--sd-border: 1px solid rgba(233,99,24, 0.18);
	--sd-shadow: 0 24px 60px -24px rgba(0, 0, 0, 0.8);
	--sd-ease: cubic-bezier(0.22, 1, 0.36, 1);
	--sd-maxw: 1200px;
}

/* ---------- Base helpers ---------- */
.sd-section { padding-block: clamp(4rem, 3rem + 6vw, 8rem); position: relative; }
.sd-container { max-width: var(--sd-maxw); margin-inline: auto; padding-inline: 1.5rem; }
.sd-eyebrow {
	display: inline-block; font-size: 0.95rem; letter-spacing: 0.2em; text-transform: uppercase;
	color: var(--sd-gold); font-weight: 700; margin-bottom: 1.15rem;
}
.sd-lead { color: var(--sd-mist); font-size: clamp(1.05rem, 1rem + 0.4vw, 1.25rem); max-width: 56ch; }

/* Reveal-on-scroll (driven by GSAP; CSS fallback keeps content visible) */
.sd-reveal { opacity: 1; }
.js .sd-reveal { opacity: 0; transform: translateY(28px); }

/* ---------- Buttons ---------- */
.sd-btn {
	display: inline-flex; align-items: center; gap: 0.5rem; cursor: pointer;
	font-family: 'Inter', sans-serif; font-weight: 600; font-size: 1rem; line-height: 1;
	padding: 0.95rem 1.9rem; border-radius: var(--sd-radius-pill);
	text-decoration: none; transition: transform .3s var(--sd-ease), box-shadow .3s var(--sd-ease), background .3s;
}
.sd-btn--primary { background: var(--sd-gold); color: var(--sd-obsidian); box-shadow: 0 10px 30px -10px rgba(233,99,24,.6); }
.sd-btn--primary:hover { background: var(--sd-gold-bright); transform: translateY(-3px); box-shadow: 0 16px 40px -12px rgba(233,99,24,.75); }
.sd-btn--ghost { background: transparent; color: var(--sd-cloud); border: 1px solid rgba(237,237,242,.25); }
.sd-btn--ghost:hover { border-color: var(--sd-gold); color: var(--sd-gold); transform: translateY(-3px); }

/* ============================================================
   MODULE 1 — Particle Hero with shimmer headline
   ============================================================ */
.sd-hero {
	position: relative; min-height: 92vh; display: flex; align-items: center; justify-content: center;
	overflow: hidden; background: radial-gradient(120% 120% at 50% 0%, #15151C 0%, #0B0B0F 70%);
	text-align: center;
}
.sd-hero__canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.sd-hero__inner { position: relative; z-index: 2; padding: 2rem 1.5rem; max-width: 1000px; }
.sd-hero__kicker { color: var(--sd-gold); letter-spacing: 0.28em; text-transform: uppercase; font-size: 0.85rem; font-weight: 600; margin-bottom: 1.5rem; }
.sd-hero__title {
	font-family: 'Playfair Display', serif; font-weight: 700; line-height: 1.08;
	font-size: clamp(2.6rem, 1.6rem + 5vw, 5.5rem); margin: 0 auto 1.5rem; letter-spacing: -0.01em;
}
/* Shimmer / flowing-light effect on the gold words */
.sd-shimmer {
	background: linear-gradient(110deg, var(--sd-gold) 20%, var(--sd-gold-bright) 40%, var(--sd-white) 50%, var(--sd-gold-bright) 60%, var(--sd-gold) 80%);
	background-size: 200% auto; -webkit-background-clip: text; background-clip: text;
	-webkit-text-fill-color: transparent; color: transparent;
	animation: sd-shimmer 6s linear infinite;
}
@keyframes sd-shimmer { to { background-position: -200% center; } }
.sd-hero__sub { color: var(--sd-mist); font-size: clamp(1.05rem, 1rem + 0.5vw, 1.35rem); max-width: 60ch; margin: 0 auto 2.5rem; }
.sd-hero__cta { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.sd-hero__scroll { position: absolute; bottom: 1.5rem; left: 50%; transform: translateX(-50%); color: var(--sd-mist); font-size: 0.75rem; letter-spacing: 0.2em; text-transform: uppercase; z-index: 2; }
@media (prefers-reduced-motion: reduce) { .sd-shimmer { animation: none; } }
/* Mobile: stop the hero CTAs overlapping the scroll cue */
@media (max-width: 600px) {
	.sd-hero { min-height: auto; }
	.sd-hero__inner { padding-top: 5rem; padding-bottom: 5rem; }
	.sd-hero__scroll { display: none; }
}

/* ============================================================
   MODULE 2 — Pain-point 3D flip cards (AU mind vs CN reality)
   ============================================================ */
.sd-flips { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.75rem; margin-top: 3rem; }
.sd-flip { perspective: 1400px; min-height: 340px; }
.sd-flip__inner { position: relative; width: 100%; height: 100%; min-height: 340px; transition: transform .8s var(--sd-ease); transform-style: preserve-3d; }
.sd-flip:hover .sd-flip__inner, .sd-flip:focus-within .sd-flip__inner { transform: rotateY(180deg); }
.sd-flip__face {
	position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
	border-radius: var(--sd-radius); padding: 2rem; display: flex; flex-direction: column;
	border: var(--sd-border); overflow: hidden;
}
.sd-flip__front { background: linear-gradient(160deg, #15151C, #0B0B0F); }
.sd-flip__back { background: linear-gradient(160deg, #1c1812, #0B0B0F); transform: rotateY(180deg); border-color: rgba(233,99,24,.5); }
.sd-flip__num { font-family: 'Playfair Display', serif; font-size: 2.5rem; color: rgba(233,99,24,.35); line-height: 1; }
.sd-flip__label { font-size: 0.75rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--sd-gold); margin: 1.25rem 0 0.6rem; font-weight: 600; }
.sd-flip__front h3 { font-size: 1.4rem; margin: 0 0 0.75rem; color: var(--sd-white); }
.sd-flip__front p { color: var(--sd-mist); font-size: 0.98rem; margin: 0; }
.sd-flip__back h3 { font-size: 1.25rem; margin: 0 0 0.75rem; color: var(--sd-gold-bright); }
.sd-flip__back p { color: var(--sd-cloud); font-size: 0.98rem; margin: 0; }
.sd-flip__hint { margin-top: auto; font-size: 0.78rem; color: var(--sd-mist); opacity: 0.7; }
.sd-flip__solve { margin-top: auto; font-size: 0.8rem; color: var(--sd-gold); font-weight: 600; }

/* ============================================================
   MODULE 3 — Scroll-triggered count-up stats
   ============================================================ */
.sd-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1.5rem; margin-top: 3rem; }
.sd-stat { text-align: center; padding: 2rem 1rem; border-radius: var(--sd-radius); background: linear-gradient(160deg, #15151C, #0B0B0F); border: var(--sd-border); }
.sd-stat__num { font-family: 'Playfair Display', serif; font-weight: 700; font-size: clamp(2.5rem, 2rem + 2.5vw, 3.75rem); line-height: 1;
	background: linear-gradient(120deg, var(--sd-gold), var(--sd-gold-bright)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.sd-stat__suffix { -webkit-text-fill-color: var(--sd-gold); color: var(--sd-gold); }
.sd-stat__label { color: var(--sd-mist); font-size: 0.9rem; margin-top: 0.75rem; letter-spacing: 0.04em; }

/* ---------- Generic content cards (services / credentials) ---------- */
.sd-grid { display: grid; gap: 1.5rem; }
.sd-grid--3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.sd-grid--4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.sd-card { padding: 2rem; border-radius: var(--sd-radius); background: linear-gradient(160deg, #15151C, #0B0B0F); border: var(--sd-border); transition: transform .35s var(--sd-ease), border-color .35s; }
.sd-card:hover { transform: translateY(-6px); border-color: rgba(233,99,24,.5); }
.sd-card h3 { font-size: 1.3rem; margin: 0 0 0.6rem; color: var(--sd-white); }
.sd-card p { color: var(--sd-mist); margin: 0; font-size: 0.97rem; }
.sd-card__icon { font-size: 1.75rem; margin-bottom: 1rem; }

/* ---------- Credential chips ---------- */
.sd-chips { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 2.25rem; }
.sd-chip { padding: 0.85rem 1.5rem; border-radius: var(--sd-radius-pill); border: 1px solid rgba(233,99,24,.45); color: var(--sd-white); font-size: 0.98rem; font-weight: 500; line-height: 1.5; background: rgba(233,99,24,.14); }

/* ---------- Section headings ---------- */
.sd-h2 { font-family: 'Playfair Display', serif; font-size: clamp(2rem, 1.5rem + 2.5vw, 3.25rem); color: var(--sd-white); margin: 0 0 1rem; line-height: 1.12; }
.sd-center { text-align: center; }
.sd-center .sd-lead { margin-inline: auto; }

/* ---------- Sticky header ---------- */
.sd-header { position: sticky; top: 0; z-index: 200; background: var(--sd-obsidian); transition: box-shadow .3s, background .3s; }
.sd-header.is-stuck { box-shadow: 0 8px 30px -12px rgba(0,0,0,.85); background: rgba(11,11,15,.92); backdrop-filter: blur(8px); }
.sd-header-logo { display: inline-flex; align-items: center; }
.sd-header-logo img { height: 32px; width: auto; display: block; }

/* ---------- Language-aware header nav (desktop) ---------- */
.sd-nav { display: flex; align-items: center; gap: 1.75rem; flex-wrap: nowrap; justify-content: flex-end; }
.sd-nav__link { display: inline-flex; align-items: center; gap: .25rem; color: var(--sd-cloud); text-decoration: none; font-size: 0.95rem; font-weight: 500; line-height: 1; transition: color .2s; white-space: nowrap; }
.sd-nav__link:hover { color: var(--sd-gold); }
.sd-nav__has-sub { position: relative; display: inline-flex; align-items: center; }
.sd-nav__sub {
	position: absolute; top: 100%; left: 50%; transform: translateX(-50%) translateY(8px);
	background: #15151C; border: 1px solid rgba(233,99,24,.25); border-radius: 12px;
	padding: 0.5rem; min-width: 240px; display: flex; flex-direction: column; gap: 0.15rem;
	opacity: 0; visibility: hidden; transition: opacity .2s, transform .2s; z-index: 50; box-shadow: var(--sd-shadow);
}
.sd-nav__has-sub:hover .sd-nav__sub, .sd-nav__has-sub:focus-within .sd-nav__sub { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(4px); }
.sd-nav__sub a { color: var(--sd-cloud); text-decoration: none; font-size: 0.9rem; padding: 0.65rem 0.9rem; border-radius: 8px; transition: background .2s, color .2s; white-space: nowrap; }
.sd-nav__sub a:hover { background: rgba(233,99,24,.12); color: var(--sd-gold); }
.sd-nav__lang { display: inline-flex; gap: 0.7rem; align-items: center; padding-left: 1.1rem; border-left: 1px solid rgba(237,237,242,.18); }
.sd-nav__lang .sd-nav__link.is-active { color: var(--sd-gold); font-weight: 700; }

/* ---------- Hamburger toggle (hidden on desktop) ---------- */
.sd-nav-toggle { display: none; flex-direction: column; justify-content: center; gap: 5px; width: 42px; height: 42px; padding: 9px; background: transparent; border: 1px solid rgba(237,237,242,.2); border-radius: 10px; cursor: pointer; }
.sd-nav-toggle span { display: block; height: 2px; width: 100%; background: var(--sd-cloud); border-radius: 2px; transition: transform .3s, opacity .3s; }
html.is-nav-open .sd-nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
html.is-nav-open .sd-nav-toggle span:nth-child(2) { opacity: 0; }
html.is-nav-open .sd-nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Mobile: panel + hamburger ---------- */
@media (max-width: 860px) {
	.sd-nav-toggle { display: flex; }
	.sd-nav {
		position: absolute; top: 100%; left: 0; right: 0;
		flex-direction: column; align-items: flex-start; gap: 0.25rem;
		background: var(--sd-obsidian); border-top: 1px solid rgba(233,99,24,.2);
		padding: 1rem 1.5rem 1.5rem; box-shadow: var(--sd-shadow);
		max-height: calc(100vh - 72px); overflow-y: auto; display: none;
	}
	html.is-nav-open .sd-nav { display: flex; }
	.sd-nav__link { width: 100%; padding: 0.7rem 0; font-size: 1.05rem; }
	.sd-nav__has-sub { flex-direction: column; align-items: flex-start; width: 100%; }
	.sd-nav__sub,
	.sd-nav__has-sub:hover .sd-nav__sub,
	.sd-nav__has-sub:focus-within .sd-nav__sub { position: static; transform: none; opacity: 1; visibility: visible; box-shadow: none; min-width: 0; max-width: 100%; background: transparent; border: none; padding: 0 0 0.5rem 1rem; }
	.sd-nav__sub a { padding: 0.55rem 0; white-space: normal; }
	.sd-nav__lang { width: 100%; padding: 0.6rem 0 0; margin-top: 0.4rem; border-left: none; border-top: 1px solid rgba(237,237,242,.14); }
}