/* ═══════════════════════════════════════════════════════
   ESPSOL DevKit page — standalone styles
   Accent: --espsol: #22d3ee (sky-cyan)
   ═══════════════════════════════════════════════════════ */

:root {
    --espsol: #22d3ee;
    --espsol-dim: rgba(34, 211, 238, 0.12);
    --espsol-glow: rgba(34, 211, 238, 0.22);
}

/* ──────────────────────────────────────────────────────
   HERO — two-column with board gallery on left
   ────────────────────────────────────────────────────── */
.espsol-hero {
    display: grid;
    grid-template-columns: 1fr 1.15fr;
    gap: 56px;
    align-items: center;
    padding: 72px 0 56px;
    min-height: calc(100dvh - 120px);
}

/* ── Board image gallery ── */
.espsol-hero-stage {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
}

.espsol-board-gallery {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    width: 100%;
}

.espsol-board-glow {
    position: absolute;
    inset: 10% 15%;
    border-radius: 50%;
    background: radial-gradient(ellipse, var(--espsol-glow) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    animation: espsolGlowPulse 3.5s ease-in-out infinite;
}

@keyframes espsolGlowPulse {
    0%, 100% { opacity: 0.7; transform: scale(1); }
    50%       { opacity: 1;   transform: scale(1.06); }
}

.espsol-board-img {
    position: relative;
    z-index: 1;
    width: min(380px, 100%);
    height: auto;
    display: block;
    filter: drop-shadow(0 0 28px var(--espsol-glow));
    transition: opacity 0.2s ease;
}

/* Front/Back thumbnails */
.espsol-board-thumbs {
    position: relative;
    z-index: 2;
    display: flex;
    gap: 10px;
}

.espsol-thumb {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 8px 14px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 6px;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    color: var(--muted);
}

.espsol-thumb img {
    width: 40px;
    height: 40px;
    object-fit: contain;
    border-radius: 50%;
    opacity: 0.6;
    transition: opacity 0.15s;
}

.espsol-thumb.is-active,
.espsol-thumb:hover {
    border-color: var(--espsol);
    background: var(--espsol-dim);
    color: var(--espsol);
}

.espsol-thumb.is-active img,
.espsol-thumb:hover img {
    opacity: 1;
}

/* ── Hero copy ── */
.espsol-hero-copy {
    display: flex;
    flex-direction: column;
    gap: 0;
    min-width: 0;
}

.espsol-hero-title {
    font-size: clamp(3.5rem, 8vw, 7rem);
    font-weight: 600;
    line-height: 0.9;
    letter-spacing: -0.04em;
    color: var(--text);
    margin: 14px 0 20px;
}

.espsol-title-devkit {
    color: var(--espsol);
    display: block;
}

.espsol-hero-lead {
    font-size: clamp(1.1rem, 2.2vw, 1.5rem);
    font-weight: 500;
    line-height: 1.35;
    color: var(--text);
    margin: 0 0 14px;
}

.espsol-hero-desc {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--muted);
    margin: 0 0 24px;
    max-width: 460px;
}

.espsol-hero-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 16px 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    margin-bottom: 24px;
}

.espsol-meta-row {
    display: flex;
    align-items: baseline;
    gap: 12px;
}

.espsol-meta-key {
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    color: var(--muted);
    text-transform: uppercase;
    min-width: 90px;
}

.espsol-meta-val {
    font-size: 0.82rem;
    color: var(--text);
}

.espsol-hero-buttons {
    gap: 10px;
}

/* ──────────────────────────────────────────────────────
   STAT STRIP accent
   ────────────────────────────────────────────────────── */
.espsol-stat-strip .e32-stat-value {
    color: var(--espsol);
}

/* ──────────────────────────────────────────────────────
   CHIP CARD accent
   ────────────────────────────────────────────────────── */
.espsol-chip-card .e32-chip-name {
    color: var(--espsol);
}

/* ──────────────────────────────────────────────────────
   SECURE CARD accent
   ────────────────────────────────────────────────────── */
.espsol-secure-card .e32-secure-glyph {
    color: var(--espsol);
}

.espsol-secure-card .e32-secure-dot {
    background: var(--espsol);
}

/* ──────────────────────────────────────────────────────
   PERIPHERAL CARDS accent
   ────────────────────────────────────────────────────── */
.espsol-peripheral-card .e32-peripheral-num {
    color: var(--espsol);
}

/* ──────────────────────────────────────────────────────
   USB DUAL MODE CARD
   ────────────────────────────────────────────────────── */
.espsol-usb-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 0 32px var(--espsol-glow);
}

.espsol-usb-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    border-bottom: 1px solid var(--line);
    background: rgba(255,255,255,0.02);
}

.espsol-usb-icon {
    font-size: 1rem;
    color: var(--espsol);
}

.espsol-usb-title {
    font-size: 0.72rem;
    letter-spacing: 0.1em;
    color: var(--muted);
    font-weight: 600;
}

.espsol-usb-diagram {
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.espsol-usb-source {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.espsol-usb-port {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text);
    background: var(--espsol-dim);
    border: 1px solid rgba(34,211,238,0.3);
    border-radius: 6px;
    padding: 6px 18px;
}

.espsol-usb-port-note {
    font-size: 0.65rem;
    color: var(--muted);
    letter-spacing: 0.06em;
}

.espsol-usb-arrow {
    font-size: 1.2rem;
    color: var(--espsol);
    opacity: 0.6;
}

.espsol-usb-mux {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 8px 20px;
}

.espsol-usb-mux-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--espsol);
}

.espsol-usb-mux-ctrl {
    font-size: 0.65rem;
    color: var(--muted);
}

.espsol-usb-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    width: 100%;
}

.espsol-usb-path {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 12px 8px;
    border-radius: 6px;
    border: 1px solid var(--line);
    text-align: center;
}

.espsol-usb-path--a {
    background: var(--espsol-dim);
    border-color: rgba(34,211,238,0.25);
}

.espsol-usb-path--b {
    background: var(--surface);
}

.espsol-usb-path-tag {
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--espsol);
}

.espsol-usb-path--b .espsol-usb-path-tag {
    color: var(--muted);
}

.espsol-usb-path-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text);
}

.espsol-usb-path-desc {
    font-size: 0.65rem;
    color: var(--muted);
    line-height: 1.5;
}

/* ──────────────────────────────────────────────────────
   POWER CARD
   ────────────────────────────────────────────────────── */
.espsol-power-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 0 32px var(--espsol-glow);
}

.espsol-power-header {
    padding: 12px 20px;
    border-bottom: 1px solid var(--line);
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    color: var(--espsol);
    font-weight: 600;
}

.espsol-power-flow {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: center;
}

.espsol-power-row {
    display: flex;
    gap: 16px;
    width: 100%;
}

.espsol-power-source {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--text);
}

.espsol-power-icon {
    font-size: 1rem;
}

.espsol-power-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 8px 16px;
    border: 1px solid var(--line);
    border-radius: 4px;
    width: 80%;
    background: rgba(34,211,238,0.04);
}

.espsol-power-chip {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--espsol);
}

.espsol-power-chip-note {
    font-size: 0.62rem;
    color: var(--muted);
}

.espsol-power-rails {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    width: 100%;
}

.espsol-power-rail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 10px 8px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 6px;
    text-align: center;
}

.espsol-power-rail--reg {
    background: var(--espsol-dim);
    border-color: rgba(34,211,238,0.25);
}

.espsol-power-rail-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
}

.espsol-power-rail--reg .espsol-power-rail-name {
    color: var(--espsol);
}

.espsol-power-rail-note {
    font-size: 0.62rem;
    color: var(--muted);
}

.espsol-power-monitor {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px 20px;
    border-top: 1px solid var(--line);
}

.espsol-power-mon-label {
    font-size: 0.62rem;
    letter-spacing: 0.1em;
    color: var(--espsol);
    font-weight: 600;
}

.espsol-power-mon-desc {
    font-size: 0.72rem;
    color: var(--muted);
}


/* ──────────────────────────────────────────────────────
   USE CASE GRID
   ────────────────────────────────────────────────────── */
.espsol-usecase-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-top: 48px;
}

.espsol-usecase-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.espsol-usecase-card:hover {
    border-color: rgba(34, 211, 238, 0.35);
    box-shadow: 0 0 24px var(--espsol-glow);
}

.espsol-usecase-num {
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--espsol);
}

.espsol-usecase-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
    line-height: 1.3;
}

.espsol-usecase-body {
    font-size: 0.82rem;
    line-height: 1.65;
    color: var(--muted);
    margin: 0;
    flex: 1;
}

.espsol-usecase-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-top: 4px;
}

.espsol-usecase-tags span {
    font-size: 0.62rem;
    letter-spacing: 0.08em;
    color: var(--espsol);
    background: var(--espsol-dim);
    border: 1px solid rgba(34,211,238,0.2);
    border-radius: 3px;
    padding: 2px 7px;
}

/* ──────────────────────────────────────────────────────
   REPO PANEL accent
   ────────────────────────────────────────────────────── */
.espsol-repo-panel .e32-repo-dot {
    background: var(--espsol);
}

/* ──────────────────────────────────────────────────────
   CTA accent
   ────────────────────────────────────────────────────── */
.espsol-cta-section .e32-cta-title {
    color: var(--text);
}

/* ──────────────────────────────────────────────────────
   MOBILE
   ────────────────────────────────────────────────────── */
@media (max-width: 900px) {
    .espsol-hero {
        grid-template-columns: 1fr;
        padding: 48px 0 40px;
        min-height: unset;
        gap: 48px;
    }


    .espsol-usecase-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 640px) {
    .espsol-board-img {
        width: min(280px, 88vw);
    }

    .espsol-hero-title {
        font-size: clamp(3rem, 16vw, 4.5rem);
    }

    .espsol-usecase-grid {
        grid-template-columns: 1fr;
    }

    .espsol-usb-split {
        grid-template-columns: 1fr;
    }

    .espsol-power-rails {
        grid-template-columns: 1fr;
    }

    .espsol-hero-buttons .button {
        width: 100%;
        justify-content: center;
        min-height: 44px;
    }
}