/* ============================================================
   TUTORIAL SYSTEM — Shared Stylesheet
   Aesthetic: Dark terminal / editorial precision
   ============================================================ */

/* ── Variables ─────────────────────────────────────── */
:root {
    --bg: #0b0e14;
    --bg2: #111520;
    --bg3: #181d2a;
    --border: #1e2535;
    --border2: #2a3347;
    --accent: #00d4aa;
    --accent2: #0090ff;
    --accent3: #ff4d6d;
    --text: #c8d3e8;
    --text-dim: #607090;
    --text-bright: #edf2ff;
    --mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
    --sans: system-ui, -apple-system, sans-serif;
    --body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --radius: 6px;
    --sidebar-w: 260px;
    --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset ─────────────────────────────────────────── */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--body);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* ── Background grid texture ───────────────────────── */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.18;
    pointer-events: none;
    z-index: 0;
}

/* ── Layout ────────────────────────────────────────── */
.layout {
    display: grid;
    grid-template-columns: var(--sidebar-w) 1fr;
    grid-template-rows: auto 1fr;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* ── Top bar ───────────────────────────────────────── */
.topbar {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    height: 56px;
    background: rgba(11, 14, 20, 0.9);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.topbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--mono);
    font-size: 0.78rem;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: 0.04em;
}

.topbar-brand .dot {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(0.7);
    }
}

.topbar-meta {
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--text-dim);
}

/* ── Sidebar ───────────────────────────────────────── */
.sidebar {
    background: var(--bg2);
    border-right: 1px solid var(--border);
    padding: 1.5rem 0;
    position: sticky;
    top: 56px;
    height: calc(100vh - 56px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border2) transparent;
}

.sidebar-label {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0 1.25rem 0.6rem;
}

.toc-list {
    list-style: none;
}

.toc-list a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0.45rem 1.25rem;
    font-size: 0.82rem;
    color: var(--text-dim);
    text-decoration: none;
    border-left: 2px solid transparent;
    transition: all var(--transition);
}

.toc-list a:hover,
.toc-list a.active {
    color: var(--accent);
    border-left-color: var(--accent);
    background: rgba(0, 212, 170, 0.06);
}

.toc-list a .toc-num {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    opacity: 0.6;
    min-width: 20px;
}

.toc-list a.active .toc-num {
    color: var(--accent);
    opacity: 1;
}

/* ── Main content ──────────────────────────────────── */
.main {
    padding: 3rem 4rem 6rem;
    max-width: 860px;
}

/* ── Tutorial header ───────────────────────────────── */
.tutorial-header {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.tutorial-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 1.2rem;
}

.tag {
    font-family: var(--mono);
    font-size: 0.68rem;
    padding: 3px 10px;
    border-radius: 3px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.tag-primary {
    background: rgba(0, 212, 170, 0.12);
    color: var(--accent);
    border: 1px solid rgba(0, 212, 170, 0.25);
}

.tag-secondary {
    background: rgba(0, 144, 255, 0.1);
    color: var(--accent2);
    border: 1px solid rgba(0, 144, 255, 0.2);
}

.tag-warn {
    background: rgba(255, 77, 109, 0.1);
    color: var(--accent3);
    border: 1px solid rgba(255, 77, 109, 0.2);
}

.tutorial-header h1 {
    font-family: var(--sans);
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--text-bright);
    line-height: 1.15;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.tutorial-header h1 .accent-word {
    color: var(--accent);
}

.tutorial-description {
    font-size: 1.05rem;
    color: var(--text-dim);
    line-height: 1.75;
    max-width: 660px;
}

.tutorial-meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--text-dim);
}

.meta-item svg {
    color: var(--accent);
}

/* ── Sections ──────────────────────────────────────── */
.tutorial-section {
    margin-bottom: 3.5rem;
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.5s ease, transform 0.5s ease;
    max-width: 100%;
}

.tutorial-section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-anchor {
    display: block;
    height: 80px;
    margin-top: -80px;
    visibility: hidden;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1.2rem;
}

.section-number {
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--accent);
    background: rgba(0, 212, 170, 0.1);
    border: 1px solid rgba(0, 212, 170, 0.2);
    padding: 2px 8px;
    border-radius: 3px;
    letter-spacing: 0.08em;
}

h2 {
    font-family: var(--sans);
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--text-bright);
    letter-spacing: -0.01em;
}

h3 {
    font-family: var(--sans);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-bright);
    margin: 1.8rem 0 0.6rem;
}

p {
    margin-bottom: 1rem;
    overflow-wrap: break-word;
}

a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid rgba(0, 212, 170, 0.3);
    transition: border-color var(--transition);
    overflow-wrap: break-word;
}

a:hover {
    border-bottom-color: var(--accent);
}

/* ── Code blocks ───────────────────────────────────── */
.code-block {
    background: #070a0f;
    border: 1px solid var(--border2);
    border-radius: var(--radius);
    overflow: hidden;
    margin: 1.2rem 0;
    position: relative;
    max-width: 100%;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: var(--bg3);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 10px;
}

.code-lang {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.code-filename {
    font-family: var(--mono);
    font-size: 0.68rem;
    color: var(--text-dim);
    word-break: break-all;
}

.copy-btn {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    background: none;
    border: 1px solid var(--border2);
    padding: 3px 10px;
    border-radius: 3px;
    cursor: pointer;
    transition: all var(--transition);
    letter-spacing: 0.05em;
}

.copy-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.copy-btn.copied {
    color: var(--accent);
    border-color: var(--accent);
    background: rgba(0, 212, 170, 0.08);
}

pre {
    padding: 1.2rem 1.4rem;
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border2) transparent;
}

code {
    font-family: var(--mono);
    font-size: 0.84rem;
    line-height: 1.75;
    color: #a8c0e8;
}

/* Inline code */
p code,
li code {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border2);
    padding: 1px 6px;
    border-radius: 3px;
    font-size: 0.82em;
    color: var(--accent);
}

/* Syntax highlights */
.kw {
    color: #ff79c6;
}

/* keyword */
.cmd {
    color: var(--accent);
}

/* command */
.str {
    color: #f1fa8c;
}

/* string */
.cmt {
    color: #4a5568;
    font-style: italic;
}

/* comment */
.num {
    color: #bd93f9;
}

/* number */
.var {
    color: var(--accent2);
}

/* variable */
.path {
    color: #ffb86c;
}

/* path */
.flag {
    color: #50fa7b;
}

/* flag */

/* ── Callout boxes ─────────────────────────────────── */
.callout {
    display: flex;
    gap: 14px;
    padding: 1rem 1.2rem;
    border-radius: var(--radius);
    margin: 1.5rem 0;
    border-left: 3px solid;
}

.callout-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
    margin-top: 1px;
}

.callout-info {
    background: rgba(0, 144, 255, 0.07);
    border-color: var(--accent2);
}

.callout-warn {
    background: rgba(255, 184, 0, 0.07);
    border-color: #ffb800;
}

.callout-danger {
    background: rgba(255, 77, 109, 0.07);
    border-color: var(--accent3);
}

.callout-success {
    background: rgba(0, 212, 170, 0.07);
    border-color: var(--accent);
}

.callout-title {
    font-family: var(--sans);
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.3rem;
}

.callout-info .callout-title {
    color: var(--accent2);
}

.callout-warn .callout-title {
    color: #ffb800;
}

.callout-danger .callout-title {
    color: var(--accent3);
}

.callout-success .callout-title {
    color: var(--accent);
}

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

/* ── Step list ─────────────────────────────────────── */
.step-list {
    list-style: none;
    counter-reset: steps;
}

.step-list li {
    counter-increment: steps;
    display: flex;
    gap: 14px;
    padding: 0.7rem 0;
    border-bottom: 1px solid var(--border);
}

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

.step-list li::before {
    content: counter(steps, decimal-leading-zero);
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--accent);
    background: rgba(0, 212, 170, 0.08);
    border: 1px solid rgba(0, 212, 170, 0.2);
    padding: 2px 7px;
    border-radius: 3px;
    flex-shrink: 0;
    margin-top: 3px;
    height: fit-content;
}

/* ── Table ─────────────────────────────────────────── */
.table-wrapper {
    width: 100%;
    overflow-x: auto;
    margin: 1.5rem 0;
    border-radius: var(--radius);
    border: 1px solid var(--border2);
    -webkit-overflow-scrolling: touch;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    min-width: 500px;
}

.table-wrapper table {
    margin: 0;
    border: none;
}

thead tr {
    background: var(--bg3);
    border-bottom: 1px solid var(--border2);
}

th {
    font-family: var(--mono);
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--accent);
    padding: 0.6rem 1rem;
    text-align: left;
}

td {
    padding: 0.65rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

/* ── Progress bar ──────────────────────────────────── */
.reading-progress {
    position: fixed;
    top: 56px;
    left: 0;
    height: 2px;
    background: var(--accent);
    z-index: 200;
    transition: width 0.1s linear;
    box-shadow: 0 0 8px var(--accent);
}

/* ── Scroll to top ─────────────────────────────────── */
.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 40px;
    height: 40px;
    background: var(--bg3);
    border: 1px solid var(--border2);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
    color: var(--text-dim);
    font-size: 1rem;
    z-index: 150;
}

.scroll-top.visible {
    opacity: 1;
    pointer-events: all;
}

.scroll-top:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ── Lists ─────────────────────────────────────────── */
ul:not(.toc-list):not(.step-list),
ol:not(.step-list) {
    padding-left: 1.4rem;
    margin: 0.8rem 0 1rem;
}

ul:not(.toc-list):not(.step-list) li,
ol:not(.step-list) li {
    margin-bottom: 0.4rem;
}

ul:not(.toc-list):not(.step-list) li::marker {
    color: var(--accent);
}

ol:not(.step-list) li::marker {
    color: var(--accent);
    font-family: var(--mono);
    font-size: 0.8em;
}

/* ── Footer ────────────────────────────────────────── */
.tutorial-footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--text-dim);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-back a {
    color: var(--accent);
    border-bottom: none;
    display: flex;
    align-items: center;
    gap: 6px;
}

.credits {
    margin-top: 10px;
    font-size: 0.9em;
    opacity: 0.8;
    color: #50fa7b
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 1100px) {
    .main {
        padding: 3rem 2.5rem 6rem;
    }
}

@media (max-width: 960px) {
    .layout {
        display: flex;
        flex-direction: column;
        grid-template-columns: none;
    }

    .sidebar {
        display: none !important;
    }

    .main {
        padding: 2.5rem 2rem 5rem;
        max-width: 100%;
        width: 100%;
    }

    .tutorial-header h1 {
        font-size: 2rem;
    }

    .index-main {
        padding: 2.5rem 2rem 5rem;
        max-width: 100%;
        width: 100%;
    }
}

@media (max-width: 600px) {
    .main {
        padding: 2rem 1rem 4rem;
    }

    .tutorial-header h1 {
        font-size: 1.65rem;
    }

    .tutorial-meta-row {
        gap: 0.8rem 1.2rem;
    }

    .topbar {
        padding: 0 1rem;
    }

    .topbar-meta {
        display: none !important;
    }

    .index-main {
        padding: 2rem 1rem 4rem;
    }

    .index-hero h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .main {
        padding: 1.5rem 0.75rem 3rem;
    }

    .tutorial-header h1 {
        font-size: 1.5rem;
    }
}

/* ── index-specific styles ────────────────────────────────────── */

.index-main {
    grid-column: 1 / -1;
    padding: 3rem 5rem 6rem;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

.index-hero {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.index-hero h1 {
    font-family: var(--sans);
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--text-bright);
    letter-spacing: -0.025em;
    margin-bottom: 0.6rem;
}

.index-hero h1 span {
    color: var(--accent);
}

.index-meta {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text-dim);
}

.index-meta strong {
    color: var(--accent);
}

/* Search bar */
.search-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg2);
    border: 1px solid var(--border2);
    border-radius: var(--radius);
    padding: 0 1rem;
    margin-bottom: 2.5rem;
    transition: border-color 0.2s;
}

.search-bar:focus-within {
    border-color: var(--accent);
}

.search-bar svg {
    color: var(--text-dim);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    padding: 0.75rem 0;
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--text);
}

.search-input::placeholder {
    color: var(--text-dim);
}

/* Tutorial grid */
.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.2rem;
}

.tutorial-card {
    background: var(--bg2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.4rem;
    text-decoration: none !important;
    border-bottom: none !important;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    transition: border-color 0.22s, transform 0.22s, box-shadow 0.22s;
    opacity: 0;
    transform: translateY(12px);
    animation: cardIn 0.4s ease forwards;
}

.tutorial-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

@keyframes cardIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.card-title {
    font-family: var(--sans);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-bright);
    line-height: 1.3;
}

.card-desc {
    font-size: 0.82rem;
    color: var(--text-dim);
    line-height: 1.6;
    flex: 1;
}

.card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 0.6rem;
    border-top: 1px solid var(--border);
}

.card-footer-meta {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--text-dim);
}

.card-arrow {
    font-size: 0.9rem;
    color: var(--text-dim);
    transition: color 0.2s, transform 0.2s;
}

.tutorial-card:hover .card-arrow {
    color: var(--accent);
    transform: translateX(4px);
}

/* No results */
.no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 0;
    font-family: var(--mono);
    color: var(--text-dim);
    font-size: 0.85rem;
}

@media (max-width: 768px) {
    .index-main {
        padding: 2rem 1.5rem 4rem;
    }

    .index-hero h1 {
        font-size: 2rem;
    }
}

/* ── Topbar contact button ─────────────────────────── */
.topbar-contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.05em;
    color: var(--text-dim);
    background: none;
    border: 1px solid var(--border2);
    padding: 5px 14px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.topbar-contact-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: rgba(0, 212, 170, 0.06);
}

/* ── Modal backdrop ────────────────────────────────── */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(7, 10, 15, 0.85);
    backdrop-filter: blur(6px);
    z-index: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.modal-backdrop.open {
    opacity: 1;
    pointer-events: all;
}

/* ── Modal card ────────────────────────────────────── */
.modal {
    width: 100%;
    max-width: 480px;
    background: var(--bg2);
    border: 1px solid var(--border2);
    border-radius: 10px;
    overflow: hidden;
    transform: translateY(20px) scale(0.98);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
}

.modal-backdrop.open .modal {
    transform: translateY(0) scale(1);
}

.modal-stripe {
    height: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.3rem 1.6rem 0;
}

.modal-title {
    font-family: var(--sans);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-bright);
}

.modal-subtitle {
    font-family: var(--mono);
    font-size: 0.68rem;
    color: var(--text-dim);
    margin-top: 3px;
}

.modal-close {
    width: 30px;
    height: 30px;
    background: none;
    border: 1px solid var(--border2);
    border-radius: var(--radius);
    color: var(--text-dim);
    font-size: 1rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    flex-shrink: 0;
}

.modal-close:hover {
    color: var(--accent3);
    border-color: var(--accent3);
}

.modal-body {
    padding: 1.4rem 1.6rem 1.6rem;
}

/* ── Form fields ───────────────────────────────────── */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-label {
    font-family: var(--mono);
    font-size: 0.63rem;
    color: var(--text-dim);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    background: var(--bg3);
    border: 1px solid var(--border2);
    border-radius: var(--radius);
    padding: 0.65rem 0.9rem;
    font-family: var(--body);
    font-size: 0.88rem;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
    resize: none;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--text-dim);
}

.contact-form input:focus,
.contact-form textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.1);
}

.contact-form input.error,
.contact-form textarea.error {
    border-color: var(--accent3);
    box-shadow: 0 0 0 3px rgba(255, 77, 109, 0.1);
}

.contact-form textarea {
    min-height: 110px;
}

.form-submit {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-top: 4px;
}

.form-status {
    font-family: var(--mono);
    font-size: 0.72rem;
    flex: 1;
    transition: all 0.3s;
}

.form-status.success {
    color: var(--accent);
}

.form-status.error {
    color: var(--accent3);
}

.submit-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    background: var(--accent);
    color: #0b0e14;
    border: none;
    padding: 0.6rem 1.4rem;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 700;
    transition: all 0.2s;
    white-space: nowrap;
}

.submit-btn:hover:not(:disabled) {
    filter: brightness(1.1);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 212, 170, 0.35);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.submit-btn .spinner {
    width: 12px;
    height: 12px;
    border: 2px solid rgba(0, 0, 0, 0.3);
    border-top-color: #0b0e14;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: none;
}

.submit-btn.loading .spinner {
    display: block;
}

.submit-btn.loading .btn-label {
    opacity: 0.7;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 480px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ── Q-Code Specific Styles (Search & Table) ──────────────── */
.search-container {
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
    background: var(--bg2);
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.search-container label {
    font-weight: 500;
    color: var(--text-bright);
}

#qcode-search {
    flex: 1;
    min-width: 240px;
    padding: 0.6rem 1rem;
    border-radius: 40px;
    border: 1px solid var(--border2);
    background: var(--bg3);
    color: var(--text);
    font-family: var(--body);
    font-size: 0.9rem;
    transition: var(--transition);
}

#qcode-search:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(0, 212, 170, 0.2);
}

#result-counter {
    font-size: 0.8rem;
    background: var(--bg3);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    color: var(--text-dim);
}

.qtable-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg2);
    margin-bottom: 2rem;
}

.qcode-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    min-width: 700px;
}

.qcode-table th {
    background: var(--bg3);
    padding: 1rem 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--text-bright);
    border-bottom: 1px solid var(--border);
    font-family: var(--sans);
}

.qcode-table td {
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
    color: var(--text);
}

.qcode-table tr:hover td {
    background: rgba(0, 212, 170, 0.05);
}

.qcode-cell {
    font-weight: 700;
    font-family: var(--mono);
    font-size: 0.9rem;
    color: var(--accent);
    background: rgba(0, 212, 170, 0.08);
    border-right: 1px solid var(--border);
}

.question-cell,
.answer-cell {
    line-height: 1.45;
}

.empty-message {
    text-align: center;
    padding: 3rem;
    color: var(--text-dim);
    font-style: italic;
}