/* Linux CLI Playground custom brand system */
:root {
    --play-bg: #f6f1e8;
    --play-surface: #fffaf0;
    --play-ink: #17201a;
    --play-muted: #647067;
    --play-primary: #0f7c66;
    --play-primary-dark: #095c4b;
    --play-secondary: #ffb703;
    --play-accent: #f05d3b;
    --play-mint: #bfe9d8;
    --play-line: rgba(23, 32, 26, 0.12);
    --play-shadow: 0 24px 80px rgba(23, 32, 26, 0.14);
    --play-radius: 28px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Manrope", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--play-ink);
    background:
        radial-gradient(circle at 12% 14%, rgba(255, 183, 3, 0.22), transparent 26rem),
        radial-gradient(circle at 88% 20%, rgba(15, 124, 102, 0.16), transparent 22rem),
        linear-gradient(180deg, #fffaf0 0%, var(--play-bg) 44%, #edf8f1 100%);
    min-height: 100vh;
}

.site-shell {
    min-height: 100vh;
}

.py-lg-6 {
    padding-top: 6rem;
    padding-bottom: 6rem;
}

.section-pad {
    padding-top: 5rem;
    padding-bottom: 5rem;
}

.playground-nav {
    background: rgba(255, 250, 240, 0.82);
    border-bottom: 1px solid var(--play-line);
    backdrop-filter: blur(18px);
}

.navbar-brand {
    color: var(--play-ink);
    font-weight: 800;
    letter-spacing: -0.03em;
}

.brand-mark {
    display: inline-grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 14px;
    color: #eafcf4;
    background: linear-gradient(135deg, var(--play-primary), #073b35);
    font-family: "IBM Plex Mono", monospace;
    box-shadow: 0 10px 30px rgba(15, 124, 102, 0.28);
}

.nav-link {
    color: var(--play-muted);
    font-weight: 700;
}

.nav-link:hover,
.nav-link:focus {
    color: var(--play-primary-dark);
}

.hero-section {
    border-bottom: 1px solid var(--play-line);
}

.hero-copy {
    color: #4d5a52;
    max-width: 44rem;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    color: var(--play-primary-dark);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.eyebrow::before {
    content: "";
    width: 0.65rem;
    height: 0.65rem;
    border-radius: 999px;
    background: var(--play-secondary);
    box-shadow: 0 0 0 6px rgba(255, 183, 3, 0.18);
}

.display-3,
.display-5,
.h1,
h1,
h2,
h3 {
    letter-spacing: -0.045em;
}

.btn {
    border-radius: 999px;
    font-weight: 800;
    padding: 0.85rem 1.35rem;
}

.btn-primary {
    --bs-btn-bg: var(--play-primary);
    --bs-btn-border-color: var(--play-primary);
    --bs-btn-hover-bg: var(--play-primary-dark);
    --bs-btn-hover-border-color: var(--play-primary-dark);
    --bs-btn-focus-shadow-rgb: 15, 124, 102;
    box-shadow: 0 16px 34px rgba(15, 124, 102, 0.24);
}

.btn-outline-dark {
    --bs-btn-color: var(--play-ink);
    --bs-btn-border-color: rgba(23, 32, 26, 0.22);
    --bs-btn-hover-bg: var(--play-ink);
    --bs-btn-hover-border-color: var(--play-ink);
}

.runtime-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.runtime-strip span,
.difficulty {
    display: inline-flex;
    align-items: center;
    border: 1px solid var(--play-line);
    border-radius: 999px;
    color: var(--play-muted);
    background: rgba(255, 250, 240, 0.7);
    padding: 0.45rem 0.8rem;
    font-size: 0.85rem;
    font-weight: 700;
}

.shape {
    position: absolute;
    border-radius: 38% 62% 54% 46%;
    filter: blur(0.2px);
    opacity: 0.72;
}

.shape-one {
    right: 4%;
    top: 6rem;
    width: 8.5rem;
    height: 8.5rem;
    background: linear-gradient(135deg, var(--play-secondary), #ffe39b);
    transform: rotate(18deg);
}

.shape-two {
    left: 50%;
    bottom: 2rem;
    width: 5.5rem;
    height: 5.5rem;
    background: linear-gradient(135deg, var(--play-accent), #ff9b84);
    border-radius: 30px;
    transform: rotate(-20deg);
}

.terminal-card {
    position: relative;
    overflow: hidden;
    padding: 1.35rem;
    border: 1px solid rgba(191, 233, 216, 0.18);
    border-radius: var(--play-radius);
    color: #dffbed;
    background:
        linear-gradient(135deg, rgba(15, 124, 102, 0.22), transparent),
        #0d1612;
    box-shadow: var(--play-shadow);
    font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

.terminal-card::after {
    content: "";
    position: absolute;
    inset: auto -20% -45% 18%;
    height: 11rem;
    background: radial-gradient(circle, rgba(255, 183, 3, 0.24), transparent 66%);
}

.terminal-top {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.4rem;
}

.terminal-top span {
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 999px;
    background: var(--play-accent);
}

.terminal-top span:nth-child(2) {
    background: var(--play-secondary);
}

.terminal-top span:nth-child(3) {
    background: var(--play-primary);
}

.terminal-muted {
    color: #8fb5a6;
}

.terminal-line {
    color: #fff6d7;
    margin: 0.65rem 0 0.2rem;
}

.terminal-line::before {
    content: "$ ";
    color: var(--play-secondary);
}

.terminal-output {
    color: #9de4c7;
    padding-left: 1.2rem;
}

.prompt::after {
    content: "_";
    color: var(--play-secondary);
    animation: blink 1.1s steps(2, start) infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}

.stat-card,
.panel-card,
.session-card,
.form-card,
.search-card,
.detail-card,
.confirmation-card,
.tip-card,
.empty-state {
    border: 1px solid var(--play-line);
    border-radius: var(--play-radius);
    background: rgba(255, 250, 240, 0.78);
    box-shadow: 0 18px 60px rgba(23, 32, 26, 0.08);
    backdrop-filter: blur(16px);
}

.stat-card {
    padding: 1.35rem;
}

.stat-number {
    display: block;
    color: var(--play-primary-dark);
    font-size: clamp(2.1rem, 5vw, 3.4rem);
    line-height: 1;
    font-weight: 800;
    letter-spacing: -0.06em;
}

.stat-label {
    color: var(--play-muted);
    font-weight: 800;
}

.panel-card,
.form-card,
.search-card,
.detail-card,
.confirmation-card,
.tip-card,
.empty-state {
    padding: clamp(1.35rem, 3vw, 2.2rem);
}

.starter-card {
    display: flex;
    min-height: 13rem;
    flex-direction: column;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.2rem;
    border: 1px solid var(--play-line);
    border-radius: 24px;
    color: var(--play-ink);
    text-decoration: none;
    background: linear-gradient(145deg, rgba(255, 250, 240, 0.96), rgba(237, 248, 241, 0.86));
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.starter-card:hover,
.starter-card:focus {
    color: var(--play-ink);
    border-color: rgba(15, 124, 102, 0.35);
    box-shadow: 0 18px 48px rgba(15, 124, 102, 0.14);
    transform: translateY(-4px);
}

.starter-label {
    color: var(--play-primary-dark);
    font-weight: 900;
}

code,
.command-input {
    font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

.starter-card code,
.command-chip,
.command-panel code {
    display: block;
    color: #fff7db;
    background: #142019;
    border-radius: 16px;
    padding: 0.75rem 0.9rem;
    white-space: normal;
}

.starter-card small,
.session-card p {
    color: var(--play-muted);
}

.session-card {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    padding: 1.25rem;
}

.session-card h3 a {
    color: var(--play-ink);
    text-decoration: none;
}

.session-card h3 a:hover,
.card-link:hover,
.back-link:hover {
    color: var(--play-primary-dark);
}

.card-link,
.back-link {
    color: var(--play-primary);
    font-weight: 900;
    text-decoration: none;
}

.badge {
    padding: 0.55rem 0.75rem;
    font-weight: 900;
}

.status-planned {
    color: #714e00;
    background: rgba(255, 183, 3, 0.24);
}

.status-practicing {
    color: #0a5d4d;
    background: rgba(15, 124, 102, 0.16);
}

.status-complete {
    color: #174b2a;
    background: rgba(69, 184, 112, 0.2);
}

.form-control,
.form-select {
    border-color: var(--play-line);
    border-radius: 18px;
    padding: 0.85rem 1rem;
    background-color: rgba(255, 255, 255, 0.72);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--play-primary);
    box-shadow: 0 0 0 0.25rem rgba(15, 124, 102, 0.16);
}

.form-label {
    font-weight: 900;
}

.confirmation-card {
    max-width: 46rem;
    text-align: center;
}

.success-orb,
.empty-icon {
    display: inline-grid;
    place-items: center;
    width: 5rem;
    height: 5rem;
    margin-bottom: 1rem;
    border-radius: 28px;
    color: #f7fff9;
    background: linear-gradient(135deg, var(--play-primary), #073b35);
    box-shadow: 0 18px 50px rgba(15, 124, 102, 0.24);
    font-size: 2rem;
    font-weight: 900;
}

.command-panel {
    text-align: left;
}

.command-panel span {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--play-muted);
    font-size: 0.8rem;
    font-weight: 900;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.content-block {
    padding-top: 1.5rem;
    margin-top: 1.5rem;
    border-top: 1px solid var(--play-line);
}

.content-block h2 {
    font-size: 1rem;
    color: var(--play-primary-dark);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.detail-sidecar {
    top: 6rem;
}

.checklist {
    padding-left: 1.1rem;
    color: var(--play-muted);
}

.checklist li {
    margin-bottom: 0.65rem;
}

.complete-note {
    border-radius: 18px;
    color: #174b2a;
    background: rgba(69, 184, 112, 0.16);
    padding: 1rem;
    font-weight: 900;
    text-align: center;
}

.empty-state {
    padding: 4rem 2rem;
}

.alert-success {
    --bs-alert-color: #0a5d4d;
    --bs-alert-bg: #e0f6ec;
    --bs-alert-border-color: rgba(15, 124, 102, 0.2);
}

@media (max-width: 991.98px) {
    .section-pad {
        padding-top: 3.5rem;
        padding-bottom: 3.5rem;
    }

    .py-lg-6 {
        padding-top: 4rem;
        padding-bottom: 4rem;
    }

    .shape-two {
        display: none;
    }
}