/* ================= Docs / Tutorial Page Styles ================= */

/* ----- Hero ----- */
.docs-hero {
    padding-top: 140px;
    padding-bottom: 80px;
    background: linear-gradient(160deg, var(--dark-bg) 0%, #0f2a1a 60%, #153322 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.docs-hero::before {
    content: '';
    position: absolute;
    top: -40%; right: -10%;
    width: 70%; height: 160%;
    background: radial-gradient(ellipse at center, rgba(167,196,160,0.06) 0%, transparent 70%);
    pointer-events: none;
}

.docs-hero-inner {
    position: relative;
    z-index: 2;
    max-width: 760px;
}

.docs-hero-title {
    font-size: clamp(2.8rem, 4.5vw, 4.8rem);
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1.06;
    margin-bottom: 1.5rem;
    color: white;
}

.docs-hero-desc {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.65);
    line-height: 1.8;
    max-width: 580px;
    margin-bottom: 2rem;
}

/* ----- Main Section ----- */
.docs-main-section {
    padding: 0 0 100px;
    background: var(--bg-base);
}

/* ----- Platform Tabs (mirrors download.css) ----- */
.platform-tabs {
    display: flex;
    gap: 4px;
    padding: 20px 0 0;
    border-bottom: 1px solid rgba(0,0,0,0.06);
    flex-wrap: wrap;
    position: sticky;
    top: 80px;
    background: var(--bg-base);
    z-index: 100;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 22px;
    border: none;
    background: transparent;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-gray);
    cursor: pointer;
    border-radius: 8px 8px 0 0;
    transition: all 0.25s ease;
    position: relative;
    white-space: nowrap;
}

.tab-btn svg {
    width: 18px; height: 18px;
    fill: currentColor;
    flex-shrink: 0;
    opacity: 0.7;
}

.tab-btn line, .tab-btn rect, .tab-btn polyline { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.tab-btn:hover { color: var(--text-dark); background: rgba(0,0,0,0.03); }

.tab-btn.active {
    color: var(--dark-bg);
    background: white;
    box-shadow: 0 -2px 0 var(--dark-bg) inset;
}

.tab-btn.active svg { opacity: 1; }

.tab-panel { display: none; padding-top: 48px; }
.tab-panel.active { display: block; }

/* ----- Platform Header ----- */
.docs-platform-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 2rem;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.docs-platform-meta h2 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--dark-bg);
    margin-bottom: 14px;
}

.docs-platform-meta p {
    font-size: 1.05rem;
    color: var(--text-gray);
    line-height: 1.75;
    max-width: 640px;
}

.docs-dl-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 24px;
    background: var(--dark-bg);
    color: white;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.92rem;
    white-space: nowrap;
    flex-shrink: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.docs-dl-btn:hover {
    background: var(--accent-green);
    color: var(--dark-bg);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

/* ----- Tutorial Steps ----- */
.tutorial-steps {
    display: flex;
    flex-direction: column;
    gap: 0;
    margin-bottom: 64px;
}

.tutorial-step {
    display: flex;
    gap: 40px;
    padding: 48px 0;
    border-bottom: 1px solid rgba(0,0,0,0.06);
    position: relative;
}

.tutorial-step:last-child { border-bottom: none; }

.step-num {
    font-size: 4rem;
    font-weight: 800;
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--accent-green-light);
    line-height: 1;
    flex-shrink: 0;
    width: 72px;
    text-align: center;
    padding-top: 4px;
    letter-spacing: -2px;
}

.step-body {
    flex: 1;
    min-width: 0;
}

.step-title {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    line-height: 1.3;
}

.step-desc {
    font-size: 1.03rem;
    color: var(--text-gray);
    line-height: 1.8;
    margin-bottom: 16px;
}

.step-desc:last-child { margin-bottom: 0; }

.step-desc a {
    color: var(--dark-bg);
    font-weight: 600;
    border-bottom: 1px solid rgba(11,28,19,0.2);
    transition: border-color 0.2s;
}

.step-desc a:hover { border-color: var(--dark-bg); }

/* Ordered list in steps */
.step-list {
    list-style: none;
    counter-reset: step-counter;
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 14px 0 18px;
    padding: 0;
}

.step-list li {
    counter-increment: step-counter;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 1rem;
    color: var(--text-gray);
    line-height: 1.65;
    overflow-wrap: break-word;
}

.step-list li::before {
    content: counter(step-counter);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px; height: 22px;
    background: var(--dark-bg);
    color: white;
    border-radius: 50%;
    font-size: 0.72rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}

/* Plain unordered list */
.step-list-plain {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 14px 0 18px;
    padding: 0;
}

.step-list-plain li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 1rem;
    color: var(--text-gray);
    line-height: 1.65;
    padding-left: 18px;
    position: relative;
}

.step-list-plain li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-green);
    font-size: 1.2rem;
    line-height: 1.4;
}

/* Info tip callout */
.step-tip {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 18px;
    background: rgba(167,196,160,0.1);
    border-left: 3px solid rgba(167,196,160,0.6);
    border-radius: 0 8px 8px 0;
    font-size: 0.93rem;
    color: var(--text-gray);
    line-height: 1.65;
    margin: 16px 0 4px;
}

.step-tip svg {
    flex-shrink: 0;
    color: #6aaa5e;
    margin-top: 1px;
}

.step-tip-green {
    background: rgba(106,170,94,0.08);
    border-left-color: #6aaa5e;
}

/* Warning callout */
.step-warn {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 18px;
    background: rgba(245,164,58,0.08);
    border-left: 3px solid rgba(245,164,58,0.5);
    border-radius: 0 8px 8px 0;
    font-size: 0.93rem;
    color: var(--text-gray);
    line-height: 1.65;
    margin: 16px 0 4px;
}

.step-warn-top { margin: 0 0 40px; }

.step-warn svg {
    flex-shrink: 0;
    color: #c47b0a;
    margin-top: 1px;
}

/* Code block */
.step-code {
    background: var(--dark-bg);
    border-radius: 10px;
    overflow: hidden;
    margin: 16px 0;
}

.step-code-label {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: rgba(255,255,255,0.4);
    padding: 10px 18px 6px;
}

.step-code code {
    display: block;
    font-family: "SF Mono", "Fira Code", "Consolas", monospace;
    font-size: 0.9rem;
    color: var(--accent-green);
    padding: 6px 18px 16px;
    white-space: pre;
    overflow-x: auto;
    line-height: 1.6;
}

/* Proxy mode cards */
.mode-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 18px 0;
}

.mode-card {
    background: var(--bg-surface);
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: 12px;
    padding: 20px 22px;
    transition: box-shadow 0.3s;
}

.mode-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.05); }

.mode-recommend {
    border-color: rgba(106,170,94,0.3);
    background: linear-gradient(135deg, rgba(167,196,160,0.08) 0%, white 100%);
}

.mode-card-name {
    font-weight: 700;
    font-size: 1rem;
    color: var(--dark-bg);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.mode-tag {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    background: rgba(106,170,94,0.15);
    color: #3d7e36;
    padding: 2px 8px;
    border-radius: 100px;
}

.mode-card-desc {
    font-size: 0.88rem;
    color: var(--text-gray);
    line-height: 1.65;
}

/* ----- Alt clients ----- */
.alt-clients-section {
    border-top: 1px solid rgba(0,0,0,0.06);
    padding-top: 48px;
    margin-top: 8px;
}

.alt-clients-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 24px;
    letter-spacing: -0.3px;
}

.alt-clients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.alt-client-card {
    background: var(--bg-surface);
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 14px;
    padding: 24px 26px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.alt-client-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 36px rgba(0,0,0,0.06);
    border-color: rgba(0,0,0,0.1);
}

.alt-client-deprecated {
    opacity: 0.65;
}

.alt-client-name {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.deprecated-tag {
    font-size: 0.7rem;
    font-weight: 700;
    background: rgba(200,50,50,0.1);
    color: #b94444;
    padding: 2px 8px;
    border-radius: 100px;
}

.alt-client-desc {
    font-size: 0.9rem;
    color: var(--text-gray);
    line-height: 1.7;
    margin-bottom: 14px;
}

.alt-client-link {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--dark-bg);
    border-bottom: 1px solid rgba(11,28,19,0.2);
    transition: border-color 0.2s;
    padding-bottom: 1px;
}

.alt-client-link:hover { border-color: var(--dark-bg); }

/* ----- Concepts Section ----- */
.docs-concepts-section {
    padding: 100px 0;
    background: var(--bg-surface);
    border-top: 1px solid rgba(0,0,0,0.04);
}

.docs-concepts-section .section-header h2 {
    font-size: 2.8rem;
}

.concepts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}

.concept-card {
    background: var(--bg-base);
    border-radius: var(--radius-lg);
    padding: 40px 36px;
    border: 1px solid rgba(0,0,0,0.04);
}

.concept-icon {
    width: 52px; height: 52px;
    background: white;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    border: 1px solid rgba(0,0,0,0.05);
    box-shadow: 0 4px 12px rgba(0,0,0,0.04);
}

.concept-icon svg {
    width: 24px; height: 24px;
    stroke: var(--dark-bg);
}

.concept-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 16px;
    letter-spacing: -0.3px;
    line-height: 1.35;
}

.concept-card p {
    font-size: 0.95rem;
    color: var(--text-gray);
    line-height: 1.75;
    margin-bottom: 12px;
}

.concept-card p:last-child { margin-bottom: 0; }

.concept-note {
    font-size: 0.85rem !important;
    background: rgba(0,0,0,0.03);
    border-radius: 8px;
    padding: 10px 14px;
    font-family: "SF Mono", "Fira Code", monospace;
    word-break: break-all;
    color: var(--text-gray) !important;
}

.concept-note code {
    font-family: inherit;
    font-size: inherit;
    color: var(--dark-bg);
}

/* Mode comparison table */
.mode-compare-table {
    display: flex;
    flex-direction: column;
    gap: 0;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid rgba(0,0,0,0.06);
    margin-top: 4px;
}

.mct-row {
    display: flex;
    gap: 0;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 14px 18px;
    background: white;
    align-items: flex-start;
    gap: 14px;
    flex-direction: column;
    transition: background 0.2s;
}

.mct-row:last-child { border-bottom: none; }
.mct-row:hover { background: rgba(0,0,0,0.01); }

.mct-name {
    font-size: 0.92rem;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    color: var(--dark-bg);
    flex-shrink: 0;
}

.mct-desc {
    font-size: 0.88rem;
    color: var(--text-gray);
    line-height: 1.65;
}

/* Concept compare two-col */
.concept-compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 4px;
}

.compare-item {
    border-radius: 10px;
    padding: 18px;
    background: white;
    border: 1px solid rgba(0,0,0,0.06);
}

.compare-item-green {
    background: rgba(167,196,160,0.08);
    border-color: rgba(106,170,94,0.25);
}

.compare-title {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--dark-bg);
    margin-bottom: 12px;
    letter-spacing: -0.2px;
}

.compare-item ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 0;
}

.compare-item ul li {
    font-size: 0.83rem;
    color: var(--text-gray);
    line-height: 1.5;
    padding-left: 14px;
    position: relative;
}

.compare-item ul li::before {
    content: '·';
    position: absolute;
    left: 3px;
    color: var(--accent-green);
    font-size: 1.3rem;
    line-height: 1.1;
}

/* TUN concept card spans full grid width to give compare table enough space */
#tun {
    grid-column: 1 / -1;
}

/* ----- CTA Section ----- */
.docs-cta-section {
    padding: 80px 0;
    background: var(--dark-bg);
    color: white;
}

.docs-cta-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
    flex-wrap: wrap;
}

.docs-cta-text h2 {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 12px;
    color: white;
}

.docs-cta-text p {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
    max-width: 560px;
}

.docs-cta-section .btn-primary {
    background: white;
    color: var(--dark-bg);
    padding: 16px 36px;
    font-size: 1rem;
    flex-shrink: 0;
}

.docs-cta-section .btn-primary:hover {
    background: var(--accent-green);
    color: var(--dark-bg);
}

/* ================= Responsive ================= */
@media (max-width: 1024px) {
    .tutorial-step { gap: 28px; }
    .step-num { font-size: 3rem; width: 56px; }
    .mode-cards { grid-template-columns: 1fr; }
    .concepts-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .concept-compare { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .docs-hero { padding-top: 120px; }
    .docs-hero-title { font-size: 2.6rem; }

    .platform-tabs { top: 70px; }

    .docs-platform-header { flex-direction: column; gap: 20px; }
    .docs-dl-btn { width: 100%; justify-content: center; }

    .tutorial-step { flex-direction: column; gap: 8px; padding: 36px 0; }
    .step-num {
        font-size: 2rem;
        width: auto;
        text-align: left;
        color: var(--accent-green);
        letter-spacing: -1px;
    }

    .mode-cards { grid-template-columns: 1fr; }
    .alt-clients-grid { grid-template-columns: 1fr; }

    .docs-cta-inner { flex-direction: column; }
    .docs-cta-section .btn-primary { width: 100%; justify-content: center; }

    .mct-row { padding: 12px 14px; }

    .step-code code { white-space: pre-wrap; word-break: break-all; }

    /* Fix step-list flex columns on mobile */
    .step-list li {
        display: block;
        padding-left: 34px;
        position: relative;
        overflow-wrap: break-word;
    }

    .step-list li::before {
        position: absolute;
        left: 0;
        top: 2px;
        margin-top: 0;
    }

    .step-list-plain li {
        display: block;
        overflow-wrap: break-word;
    }

    .step-desc,
    .step-desc strong,
    .step-desc a,
    .step-list-plain li,
    .step-tip span {
        overflow-wrap: break-word;
    }

    .step-desc code,
    .step-list-plain li code,
    .step-list li code,
    .step-tip code {
        word-break: break-all;
        overflow-wrap: anywhere;
        white-space: pre-wrap;
    }
}

@media (max-width: 480px) {
    .tab-btn { padding: 12px 16px; font-size: 0.88rem; }
    .tab-btn svg { width: 16px; height: 16px; }
}