/* ============================================================
   MACCOME — Design System Core CSS
   "The Ethereal Architect" — v1.0
   ============================================================ */

/* ── Base ── */
html {
    scrollbar-width: none;
    -ms-overflow-style: none;
    scroll-behavior: smooth;
    overflow-x: hidden; /* 防止任何子元素导致页面横向滚动 */
}
html::-webkit-scrollbar { display: none; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    -webkit-font-smoothing: antialiased;
    background-color: #f9f9fb;
    color: #1a1c1d;
    overflow-x: hidden;
    max-width: 100%;
}

/* ── CSS Variables (Design Tokens) ── */
:root {
    --background:                #f9f9fb;
    --surface:                   #ffffff;
    --surface-container-lowest:  #ffffff;
    --surface-container-low:     #f3f3f5;
    --surface-container:         #eeeef0;
    --surface-container-high:    #e8e8ea;
    --surface-container-highest: #e2e2e4;
    --surface-dim:               #d9dadc;

    --primary:           #0059b5;
    --primary-container: #0071e3;
    --on-primary:        #ffffff;

    --on-surface:         #1a1c1d;
    --on-surface-variant: #43474e;
    --outline:            #73777f;
    --outline-variant:    #c1c6d6;

    --tertiary:           #00693e;
    --tertiary-fixed-dim: #00e38b;
    --error:              #ba1a1a;
}

/* ============================================================
   TYPOGRAPHY UTILITIES
   ============================================================ */
.label-cap {
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.headline-section {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.15;
}
.display-xl {
    font-size: clamp(3rem, 7vw, 6.5rem);
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1.04;
}

/* ============================================================
   BUTTONS
   ============================================================ */
/* Primary: "liquid silk" gradient */
.btn-primary {
    background: linear-gradient(135deg, #0059b5 0%, #0071e3 100%);
    color: #ffffff;
    cursor: pointer;
    transition: box-shadow 0.2s ease, transform 0.15s ease;
}
.btn-primary:hover  { box-shadow: 0 8px 32px rgba(0,89,181,.3); transform: translateY(-1px); }
.btn-primary:active { transform: scale(0.98); }

/* Secondary: surface-container-high fill */
.btn-secondary {
    background: #e8e8ea;
    color: #1a1c1d;
    cursor: pointer;
    transition: background 0.2s ease;
}
.btn-secondary:hover { background: #e2e2e4; }

/* ============================================================
   ELEVATION — ambient shadows only, no hard borders
   ============================================================ */
.card-lift  { box-shadow: 0 0 40px 0 rgba(26,28,29,.06); }
.card-hover { transition: box-shadow 0.3s ease, transform 0.3s ease; }
.card-hover:hover {
    box-shadow: 0 12px 48px 0 rgba(26,28,29,.10);
    transform: translateY(-3px);
}

/* Ghost border — outline_variant at 15% opacity (glassmorphism overlays only) */
.ghost-border { border: 1px solid rgba(193,198,214,.15); }

/* ============================================================
   GLASS HEADER
   ============================================================ */
/* Surface 80% opacity + 40px blur + 10% hairline per DESIGN.md */
.glass-header {
    background: rgba(255,255,255,.80);
    backdrop-filter: saturate(180%) blur(40px);
    -webkit-backdrop-filter: saturate(180%) blur(40px);
    border-bottom: 1px solid rgba(193,198,214,.10);
}

/* ============================================================
   LANGUAGE SELECTOR
   ============================================================ */
.lang-selector { position: relative; }

.lang-trigger {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(26,28,29,.5);
    padding: 6px 12px;
    border-radius: 999px;
    background: transparent;
    transition: all 0.25s ease;
    white-space: nowrap;
    border: none;
}
.lang-trigger:hover {
    color: var(--primary);
    background: var(--surface-container);
}
.lang-trigger svg { transition: transform 0.3s ease; }
.lang-selector.open .lang-trigger .lang-chevron { transform: rotate(180deg); }

.lang-dropdown {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: rgba(255,255,255,.96);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-radius: 20px;
    padding: 8px;
    min-width: 168px;
    box-shadow: 0 20px 60px rgba(26,28,29,.12), 0 4px 16px rgba(26,28,29,.06);
    opacity: 0;
    transform: translateY(-8px) scale(0.97);
    pointer-events: none;
    transition: all 0.22s cubic-bezier(0.19,1,0.22,1);
    z-index: 200;
}
.lang-selector.open .lang-dropdown {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: all;
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.15s ease;
    font-size: 0.8rem;
    font-weight: 600;
    color: rgba(26,28,29,.55);
    letter-spacing: 0.02em;
}
.lang-option:hover { background: var(--surface-container-low); color: var(--on-surface); }
.lang-option.active { background: var(--on-surface); color: #fff; }
.lang-option .lang-code {
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    opacity: 0.45;
    min-width: 28px;
    text-transform: uppercase;
}
.lang-option.active .lang-code { opacity: 0.6; }

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.8s cubic-bezier(.2,0,0,1), transform 0.8s cubic-bezier(.2,0,0,1);
}
.reveal.active { opacity: 1; transform: translateY(0); }
.d1 { transition-delay: 0.10s; }
.d2 { transition-delay: 0.20s; }
.d3 { transition-delay: 0.30s; }
.d4 { transition-delay: 0.40s; }

/* ============================================================
   STATUS DOT — Emerald pulse
   ============================================================ */
@keyframes pulse-ring {
    0%,100% { box-shadow: 0 0 0 0 rgba(0,227,139,.4); }
    50%      { box-shadow: 0 0 0 6px rgba(0,227,139,.0); }
}
.status-dot { animation: pulse-ring 2.4s ease-in-out infinite; }

/* ============================================================
   TAG CHIPS (scenario cards etc.)
   ============================================================ */
.chip {
    display: inline-block;
    background: var(--surface-container-low);
    border-radius: 999px;
    padding: 3px 10px;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: rgba(26,28,29,.45);
}

/* ============================================================
   INPUT FIELDS
   ============================================================ */
.input-field {
    width: 100%;
    background: var(--surface-container-low);
    border: 1.5px solid transparent;
    border-radius: 14px;
    padding: 14px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--on-surface);
    transition: all 0.2s ease;
    outline: none;
}
.input-field::placeholder { color: rgba(26,28,29,.28); }
.input-field:focus {
    background: var(--surface);
    border-color: rgba(0,89,181,.15);
    box-shadow: 0 0 0 3px rgba(0,89,181,.06);
}
.input-label {
    display: block;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: rgba(26,28,29,.4);
    margin-bottom: 8px;
}

/* ============================================================
   MARQUEE
   ============================================================ */
@keyframes marquee {
    from { transform: translateX(0); }
    to   { transform: translateX(-50%); }
}
.marquee-track { animation: marquee 36s linear infinite; }
.marquee-wrap:hover .marquee-track { animation-play-state: paused; }

/* ============================================================
   FLOATING ANIMATION
   ============================================================ */
@keyframes float {
    0%,100% { transform: translateY(0); }
    50%      { transform: translateY(-16px); }
}
.floating { animation: float 7s ease-in-out infinite; }

/* ============================================================
   FOOTER RESPONSIVE GRID
   ============================================================ */
.footer-cols {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 4rem;
}

/* Tablet: collapse to 3 columns */
@media (max-width: 1023px) {
    .footer-cols {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 2rem;
    }
}

/* Mobile: 2 columns, brand row spans full width */
@media (max-width: 639px) {
    .footer-cols {
        grid-template-columns: 1fr 1fr;
        gap: 2rem 1.5rem;
    }
    .footer-cols > :first-child {
        grid-column: span 2;
    }
}