/* ==========================================
   Features Page  -  features/index.html
========================================== */

/* ── Hero ─────────────────────────────── */
.feat-hero {
    position: relative;
    padding: 110px 8% 80px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    overflow: hidden;
    background:
        radial-gradient(ellipse 90% 60% at 30% -10%, rgba(37,99,235,0.10) 0%, transparent 65%),
        radial-gradient(ellipse 50% 40% at 85% 80%, rgba(124,58,237,0.07) 0%, transparent 55%);
}
.feat-hero::before {
    content: '';
    position: absolute; inset: 0; pointer-events: none;
    background-image: radial-gradient(circle, rgba(37,99,235,0.11) 1px, transparent 1px);
    background-size: 28px 28px;
    mask-image: radial-gradient(ellipse 85% 70% at 50% 25%, black 5%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 85% 70% at 50% 25%, black 5%, transparent 100%);
}
.feat-hero-content { position: relative; z-index: 1; }
.feat-hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 16px; margin-bottom: 28px;
    background: white; border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 13px; font-weight: 600; color: var(--text-2);
    box-shadow: var(--shadow-xs);
}
.feat-hero h1 {
    font-size: clamp(32px, 4.5vw, 58px);
    font-weight: 900; line-height: 1.1; letter-spacing: -2px;
    margin-bottom: 20px; color: var(--text-1);
}
.feat-hero p {
    font-size: 16.5px; color: var(--text-3);
    line-height: 1.85; max-width: 480px; margin: 0 0 36px;
}
.feat-hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── Hero Flow Visual ─────────────────── */
.feat-flow-visual {
    position: relative; z-index: 1;
    background: linear-gradient(160deg, #0f172a 0%, #1e1b4b 100%);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 24px;
    padding: 32px 28px 28px;
    box-shadow: 0 24px 64px rgba(0,0,0,0.22), 0 0 0 1px rgba(37,99,235,0.15);
    display: flex; flex-direction: column; align-items: center; gap: 0;
    overflow: hidden;
}
/* subtle grid bg */
.feat-flow-visual::before {
    content: '';
    position: absolute; inset: 0; pointer-events: none;
    background-image: radial-gradient(circle, rgba(255,255,255,0.04) 1px, transparent 1px);
    background-size: 22px 22px;
}

.ffv-label {
    font-size: 10.5px; font-weight: 700; color: rgba(255,255,255,0.3);
    text-transform: uppercase; letter-spacing: 1.5px;
    margin-bottom: 20px; position: relative;
}

/* Device */
.ffv-device {
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    position: relative; margin-bottom: 6px;
}
.ffv-icon-wrap {
    width: 60px; height: 60px; border-radius: 18px;
    background: linear-gradient(135deg, rgba(37,99,235,0.3), rgba(124,58,237,0.3));
    border: 1px solid rgba(255,255,255,0.12);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; color: white; position: relative;
    box-shadow: 0 0 0 8px rgba(37,99,235,0.08), 0 8px 24px rgba(37,99,235,0.2);
}
.ffv-icon-ring {
    position: absolute; inset: -8px; border-radius: 26px;
    border: 1.5px dashed rgba(37,99,235,0.3);
    animation: ffv-spin 12s linear infinite;
}
@keyframes ffv-spin { to { transform: rotate(360deg); } }

.ffv-device-name { font-size: 12px; font-weight: 600; color: rgba(255,255,255,0.5); }

/* Falling packets animation */
.ffv-packets {
    display: flex; flex-direction: column; align-items: center; gap: 0;
    height: 32px; margin-top: 2px; position: relative;
}
.ffv-pkt {
    width: 6px; height: 6px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), #7c3aed);
    position: absolute; top: 0;
    animation: ffv-fall 1.2s ease-in infinite;
    box-shadow: 0 0 6px rgba(37,99,235,0.6);
}
@keyframes ffv-fall {
    0%   { opacity: 0; transform: translateY(0); }
    20%  { opacity: 1; }
    100% { opacity: 0; transform: translateY(28px); }
}

/* Engine bar */
.ffv-engine {
    display: flex; align-items: center; gap: 14px;
    background: linear-gradient(135deg, #2563eb, #7c3aed);
    color: white; border-radius: 16px;
    padding: 14px 20px; width: 100%;
    box-shadow: 0 8px 28px rgba(37,99,235,0.35);
    position: relative; overflow: hidden;
    margin-bottom: 16px;
}
.ffv-engine-glow {
    position: absolute; top: -20px; right: -20px;
    width: 80px; height: 80px; border-radius: 50%;
    background: rgba(255,255,255,0.08);
    pointer-events: none;
}
.ffv-engine-icon {
    font-size: 22px; flex-shrink: 0;
    width: 42px; height: 42px; border-radius: 12px;
    background: rgba(255,255,255,0.15);
    display: flex; align-items: center; justify-content: center;
}
.ffv-engine-text { flex: 1; }
.ffv-engine-name { font-size: 14px; font-weight: 800; letter-spacing: -0.2px; }
.ffv-engine-sub  { font-size: 10.5px; opacity: 0.7; margin-top: 2px; }
.ffv-engine-badge {
    font-size: 10.5px; font-weight: 700; padding: 4px 10px;
    background: rgba(34,197,94,0.2); color: #4ade80;
    border: 1px solid rgba(34,197,94,0.3); border-radius: 20px;
    display: flex; align-items: center; gap: 4px; white-space: nowrap;
}

/* Branches */
.ffv-branches { display: grid; grid-template-columns: repeat(3,1fr); gap: 8px; width: 100%; }
.ffv-branch { display: flex; flex-direction: column; align-items: center; }

/* Connector line from engine to box */
.ffv-branch-connector {
    width: 2px; height: 16px;
    margin-bottom: 8px; border-radius: 1px;
}
.proxy-c  { background: linear-gradient(180deg, rgba(37,99,235,0.6), rgba(37,99,235,0.2)); }
.direct-c { background: linear-gradient(180deg, rgba(16,185,129,0.6), rgba(16,185,129,0.2)); }
.reject-c { background: linear-gradient(180deg, rgba(239,68,68,0.6), rgba(239,68,68,0.2)); }

/* Branch boxes */
.ffv-branch-box {
    border-radius: 12px; padding: 12px 10px;
    text-align: center; width: 100%;
    display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.ffv-box-proxy  { background: rgba(37,99,235,0.12);  border: 1px solid rgba(37,99,235,0.25); }
.ffv-box-direct { background: rgba(16,185,129,0.12); border: 1px solid rgba(16,185,129,0.25); }
.ffv-box-reject { background: rgba(239,68,68,0.10);  border: 1px solid rgba(239,68,68,0.22); }

.ffv-box-icon {
    width: 28px; height: 28px; border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    font-size: 12px;
}
.ffv-box-proxy  .ffv-box-icon { background: rgba(37,99,235,0.2);  color: #93c5fd; }
.ffv-box-direct .ffv-box-icon { background: rgba(16,185,129,0.2); color: #6ee7b7; }
.ffv-box-reject .ffv-box-icon { background: rgba(239,68,68,0.2);  color: #fca5a5; }

.ffv-box-tag {
    font-size: 9px; font-weight: 800; letter-spacing: 0.8px;
    padding: 2px 7px; border-radius: 4px;
}
.ffv-box-proxy  .ffv-box-tag { color: #93c5fd; background: rgba(37,99,235,0.2); }
.ffv-box-direct .ffv-box-tag { color: #6ee7b7; background: rgba(16,185,129,0.2); }
.ffv-box-reject .ffv-box-tag { color: #fca5a5; background: rgba(239,68,68,0.2); }

.ffv-box-items {
    display: flex; flex-direction: column; gap: 2px;
}
.ffv-box-items span {
    font-size: 9.5px; color: rgba(255,255,255,0.4);
    font-family: var(--font-mono); line-height: 1.5;
}

@media (max-width: 900px) {
    .feat-hero { grid-template-columns: 1fr; text-align: center; padding: 100px 5% 60px; }
    .feat-flow-visual { display: none; }
    .feat-hero p { max-width: 600px; margin: 0 auto 36px; }
    .feat-hero-actions { justify-content: center; }
}

/* ── What is Clash ────────────────────── */
.what-section {
    padding: 88px 5%;
    background: var(--bg-2);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.what-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px; align-items: center;
    max-width: 1100px; margin: 0 auto;
}
.what-text h2 {
    font-size: clamp(26px, 3.5vw, 38px);
    font-weight: 800; line-height: 1.2; letter-spacing: -0.5px;
    margin-bottom: 18px; color: var(--text-1);
}
.what-text p { font-size: 15.5px; color: var(--text-3); line-height: 1.85; margin-bottom: 14px; }
.what-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
.what-tag {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 5px 12px; border-radius: var(--radius-full);
    background: white; border: 1px solid var(--border);
    font-size: 12.5px; font-weight: 600; color: var(--text-2);
    box-shadow: var(--shadow-xs);
}
.what-tag i { color: var(--primary); }
.what-visual {
    background: white; border: 1px solid var(--border);
    border-radius: var(--radius-xl); padding: 28px;
    box-shadow: var(--shadow-md);
}
.what-visual-title {
    font-size: 11px; font-weight: 700; color: var(--text-4);
    letter-spacing: 1.5px; text-transform: uppercase;
    margin-bottom: 18px; padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}
.stat-row {
    display: flex; justify-content: space-between; align-items: center;
    padding: 10px 0; border-bottom: 1px solid var(--border);
}
.stat-row:last-child { border-bottom: none; }
.stat-row-label { font-size: 13.5px; color: var(--text-3); }
.stat-row-val { font-size: 13.5px; font-weight: 700; font-family: var(--font-mono); color: var(--text-1); }
.stat-row-val.green  { color: var(--success); }
.stat-row-val.blue   { color: var(--primary); }
.stat-row-val.purple { color: var(--accent); }

/* ══════════════════════════════════════
   BENTO GRID  -  Core Features
══════════════════════════════════════ */
.core-section { padding: 100px 5%; }
.core-section .section-header {
    display: flex; flex-direction: column; align-items: center;
    text-align: center; margin-bottom: 64px;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    grid-auto-rows: auto;
    gap: 20px;
    max-width: 1100px; margin: 0 auto;
}

/* ---- base cell ---- */
.bc {
    border-radius: 20px;
    padding: 32px;
    position: relative; overflow: hidden;
    background: white;
    border: 1px solid var(--border);
    transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.bc:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

/* ---- span helpers ---- */
.bc-8  { grid-column: span 8; }
.bc-7  { grid-column: span 7; }
.bc-6  { grid-column: span 6; }
.bc-5  { grid-column: span 5; }
.bc-4  { grid-column: span 4; }
.bc-3  { grid-column: span 3; }

/* ---- colour variants ---- */
.bc-dark {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    border-color: rgba(255,255,255,0.06);
    color: white;
}
.bc-dark .bc-title { color: white; }
.bc-dark .bc-desc  { color: rgba(255,255,255,0.58); }
.bc-dark .bc-label { background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.7); }

.bc-blue {
    background: linear-gradient(135deg, rgba(37,99,235,0.08) 0%, rgba(37,99,235,0.03) 100%);
    border-color: rgba(37,99,235,0.18);
}
.bc-purple {
    background: linear-gradient(135deg, rgba(124,58,237,0.08) 0%, rgba(124,58,237,0.03) 100%);
    border-color: rgba(124,58,237,0.18);
}
.bc-green {
    background: linear-gradient(135deg, rgba(16,185,129,0.08) 0%, rgba(16,185,129,0.03) 100%);
    border-color: rgba(16,185,129,0.18);
}

/* ---- cell content ---- */
.bc-icon {
    width: 44px; height: 44px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    font-size: 19px; margin-bottom: 20px;
}
.bc-icon-blue   { background: var(--primary-light); color: var(--primary); }
.bc-icon-purple { background: var(--accent-light);  color: var(--accent); }
.bc-icon-green  { background: rgba(16,185,129,0.12); color: var(--success); }
.bc-icon-orange { background: rgba(245,158,11,0.12); color: var(--warning); }
.bc-icon-white  { background: rgba(255,255,255,0.12); color: white; }

.bc-title {
    font-size: 17px; font-weight: 800;
    letter-spacing: -0.3px; margin-bottom: 10px; color: var(--text-1);
}
.bc-desc {
    font-size: 13.5px; color: var(--text-3); line-height: 1.75;
}
.bc-label {
    display: inline-block; margin-top: 16px;
    padding: 3px 10px; border-radius: var(--radius-full);
    font-size: 11px; font-weight: 700; letter-spacing: 0.4px;
    background: var(--primary-light); color: var(--primary);
}
.bc-label.green  { background: rgba(16,185,129,0.12); color: var(--success); }
.bc-label.purple { background: var(--accent-light);   color: var(--accent); }

/* ---- big-number cell ---- */
.bc-bignum {
    font-size: 68px; font-weight: 900; line-height: 1;
    letter-spacing: -3px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}
.bc-bignum-label { font-size: 13px; color: var(--text-3); font-weight: 600; }

/* ---- code snippet inside cell ---- */
.bc-code {
    margin-top: 18px;
    background: rgba(15,23,42,0.04);
    border: 1px solid rgba(15,23,42,0.07);
    border-radius: 10px; padding: 14px 16px;
    font-family: var(--font-mono); font-size: 12px;
    color: var(--text-2); line-height: 1.7;
    white-space: pre;
}
.bc-dark .bc-code {
    background: rgba(255,255,255,0.05);
    border-color: rgba(255,255,255,0.08);
    color: rgba(255,255,255,0.7);
}
.bc-code .kw  { color: var(--primary); font-weight: 700; }
.bc-code .val { color: var(--success); }
.bc-code .str { color: var(--accent); }

/* ---- proto pill list inside cell ---- */
.bc-pills { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 18px; }
.bc-pill {
    padding: 4px 11px; border-radius: 6px;
    font-size: 12px; font-weight: 600; font-family: var(--font-mono);
    background: rgba(37,99,235,0.08); color: var(--primary);
    border: 1px solid rgba(37,99,235,0.14);
}
.bc-pill.p   { background: rgba(124,58,237,0.08); color: var(--accent);  border-color: rgba(124,58,237,0.14); }
.bc-pill.g   { background: rgba(16,185,129,0.09); color: var(--success); border-color: rgba(16,185,129,0.15); }
.bc-pill.n   { background: var(--bg-3); color: var(--text-3); border-color: var(--border); }

/* ---- flow mini visual ---- */
.bc-flow { display: flex; flex-direction: column; gap: 10px; margin-top: 18px; }
.bc-flow-item {
    display: flex; align-items: center; gap: 10px;
    padding: 9px 12px; border-radius: 10px;
    background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.1);
    font-size: 12.5px; font-weight: 600; color: rgba(255,255,255,0.8);
}
.bc-flow-item i { color: rgba(255,255,255,0.5); width: 16px; text-align: center; }

/* ── Protocol Section ─────────────────── */
.proto-section {
    padding: 88px 5%;
    background: var(--bg-2);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.proto-section .section-header {
    display: flex; flex-direction: column; align-items: center;
    text-align: center; margin-bottom: 56px;
}
.proto-table {
    max-width: 1100px; margin: 0 auto;
    display: flex; flex-direction: column; gap: 0;
    border: 1px solid var(--border); border-radius: var(--radius-xl);
    overflow: hidden; background: white;
    box-shadow: var(--shadow-sm);
}
.proto-row {
    display: grid;
    grid-template-columns: 180px 1fr;
    border-bottom: 1px solid var(--border);
    transition: background 0.2s;
}
.proto-row:last-child { border-bottom: none; }
.proto-row:hover { background: var(--bg-2); }
.proto-cat {
    padding: 20px 24px;
    display: flex; align-items: center; gap: 10px;
    font-size: 12px; font-weight: 700; color: var(--text-3);
    letter-spacing: 0.8px; text-transform: uppercase;
    border-right: 1px solid var(--border);
    background: var(--bg-2);
}
.proto-cat i { color: var(--primary); font-size: 14px; }
.proto-vals {
    padding: 16px 24px;
    display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
}
.proto-tag {
    padding: 5px 12px; border-radius: 7px;
    font-size: 12.5px; font-weight: 600; font-family: var(--font-mono);
    background: var(--bg-3); color: var(--text-2); border: 1px solid var(--border);
}
.proto-tag.b { background: var(--primary-light); color: var(--primary); border-color: rgba(37,99,235,0.2); }
.proto-tag.p { background: var(--accent-light);  color: var(--accent);  border-color: rgba(124,58,237,0.2); }
.proto-tag.g { background: rgba(16,185,129,0.1); color: var(--success); border-color: rgba(16,185,129,0.2); }

/* ── How it Works  -  Vertical Steps ─── */
.how-section { padding: 96px 5%; }
.how-section .section-header {
    display: flex; flex-direction: column; align-items: center;
    text-align: center; margin-bottom: 64px;
}
.steps-wrap {
    max-width: 760px; margin: 0 auto;
    display: flex; flex-direction: column; gap: 0;
}
.step-item {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 0 28px;
    position: relative;
}
.step-left {
    display: flex; flex-direction: column; align-items: center;
}
.step-num {
    width: 56px; height: 56px; border-radius: 50%; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; font-weight: 900; z-index: 1;
    background: white; border: 2px solid var(--border);
    color: var(--text-3); box-shadow: var(--shadow-xs);
    transition: var(--trans);
}
.step-item:nth-child(3) .step-num {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-color: transparent; color: white;
    box-shadow: 0 6px 20px var(--primary-glow);
}
.step-line {
    width: 2px; flex: 1; min-height: 40px;
    background: linear-gradient(180deg, var(--border) 0%, transparent 100%);
    margin: 4px 0;
}
.step-item:last-child .step-line { display: none; }
.step-content {
    padding: 10px 0 44px;
}
.step-title {
    font-size: 17px; font-weight: 800;
    color: var(--text-1); margin-bottom: 8px; letter-spacing: -0.2px;
}
.step-desc {
    font-size: 14.5px; color: var(--text-3); line-height: 1.75;
}
.step-sub-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.step-tag {
    padding: 3px 10px; border-radius: 6px;
    font-size: 12px; font-weight: 600; font-family: var(--font-mono);
    background: var(--bg-3); color: var(--text-3); border: 1px solid var(--border);
}

/* ── Strategy  -  Feature List ───────── */
.strategy-section {
    padding: 88px 5%;
    background: var(--bg-2);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.strategy-section .section-header {
    display: flex; flex-direction: column; align-items: center;
    text-align: center; margin-bottom: 56px;
}
.strategy-list {
    max-width: 1100px; margin: 0 auto;
    display: grid; grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.sl-item {
    display: flex; gap: 20px; align-items: flex-start;
    background: white; border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 24px;
    transition: var(--trans);
}
.sl-item:hover {
    border-color: var(--border-focus);
    box-shadow: var(--shadow-sm); transform: translateY(-2px);
}
.sl-num {
    flex-shrink: 0; width: 38px; height: 38px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px; font-weight: 900; font-family: var(--font-mono);
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
}
.sl-body h4 { font-size: 15px; font-weight: 700; margin-bottom: 5px; color: var(--text-1); }
.sl-body p  { font-size: 13.5px; color: var(--text-3); line-height: 1.65; }

/* ── Use Cases ────────────────────────── */
.usecases-section { padding: 96px 5%; }
.usecases-section .section-header {
    display: flex; flex-direction: column; align-items: center;
    text-align: center; margin-bottom: 56px;
}
.usecases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px; max-width: 1100px; margin: 0 auto;
}
.usecase-card {
    border-radius: 20px; padding: 36px 30px;
    position: relative; overflow: hidden;
    transition: var(--trans);
}
.usecase-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.usecase-card.uc-blue   { background: linear-gradient(145deg, rgba(37,99,235,0.08), rgba(37,99,235,0.02)); border: 1px solid rgba(37,99,235,0.15); }
.usecase-card.uc-purple { background: linear-gradient(145deg, rgba(124,58,237,0.08), rgba(124,58,237,0.02)); border: 1px solid rgba(124,58,237,0.15); }
.usecase-card.uc-green  { background: linear-gradient(145deg, rgba(16,185,129,0.08), rgba(16,185,129,0.02)); border: 1px solid rgba(16,185,129,0.15); }
.uc-icon { font-size: 34px; margin-bottom: 20px; display: block; }
.usecase-card h3 { font-size: 18px; font-weight: 800; margin-bottom: 12px; color: var(--text-1); }
.usecase-card p  { font-size: 14px; color: var(--text-3); line-height: 1.8; }

/* ── CTA ──────────────────────────────── */
.feat-cta {
    padding: 100px 5%;
    text-align: center;
    background: linear-gradient(135deg, rgba(37,99,235,0.05) 0%, rgba(124,58,237,0.04) 100%);
    border-top: 1px solid var(--border);
}
.feat-cta h2 {
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 900; letter-spacing: -1.5px;
    margin-bottom: 16px; color: var(--text-1);
}
.feat-cta p {
    font-size: 16px; color: var(--text-3);
    max-width: 480px; margin: 0 auto 36px; line-height: 1.7;
}
.feat-cta-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ── Responsive ───────────────────────── */
@media (max-width: 900px) {
    .bc-8 { grid-column: span 12; }
    .bc-7 { grid-column: span 12; }
    .bc-6 { grid-column: span 12; }
    .bc-5 { grid-column: span 12; }
    .bc-4 { grid-column: span 6; }
    .bc-3 { grid-column: span 6; }
    .strategy-list { grid-template-columns: 1fr; }
    .usecases-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .what-grid { grid-template-columns: 1fr; gap: 40px; }
    .proto-row { grid-template-columns: 1fr; }
    .proto-cat { border-right: none; border-bottom: 1px solid var(--border); background: var(--bg-3); }
    .bc-4 { grid-column: span 12; }
    .bc-3 { grid-column: span 12; }
}
@media (max-width: 480px) {
    .bc-code { font-size: 11px; overflow-x: auto; }
    .bc { padding: 20px; }
    .bc-bignum { font-size: 48px; }
}

/* 各区块垂直间距缩减 */
@media (max-width: 768px) {
    .feat-hero  { padding: 88px 5% 48px; }
    .what-section, .bento-section, .strategy-section,
    .usecases-section, .proto-section, .core-section,
    .feat-cta-section { padding-top: 60px; padding-bottom: 60px; }
    .feat-flow-visual { margin-top: 40px; }
    .bc { padding: 24px; }
    .bc-bignum { font-size: 54px; }
}

@media (max-width: 480px) {
    .feat-hero  { padding: 80px 5% 40px; }
    .what-section, .bento-section, .strategy-section,
    .usecases-section, .proto-section, .core-section,
    .feat-cta-section { padding-top: 48px; padding-bottom: 48px; }
}