:root {
    --tutorial-red: #ef0716;
    --tutorial-red-dark: #c8000c;
    --tutorial-ink: #151b25;
    --tutorial-muted: #687386;
    --tutorial-line: #e2e6ed;
    --tutorial-soft: #f4f6f9;
    --tutorial-white: #fff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 104px; }
body { margin: 0; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
.screen-reader-text { width: 1px; height: 1px; padding: 0; position: absolute; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

.tutorial-library-body {
    min-width: 320px;
    color: var(--tutorial-ink);
    background: #f7f8fa;
    font-family: "DM Sans", sans-serif;
}

.tutorial-header {
    min-height: 76px;
    padding: 14px clamp(20px, 4vw, 68px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid rgba(224, 228, 235, 0.88);
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(18px);
}

.tutorial-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    color: var(--tutorial-ink);
    text-decoration: none;
}

.tutorial-brand strong,
.tutorial-footer strong {
    font-family: "Plus Jakarta Sans", sans-serif;
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: 0.02em;
}
.tutorial-brand strong span,
.tutorial-footer strong span { color: var(--tutorial-red); }
.tutorial-brand i { width: 1px; height: 26px; background: #d6dae1; }
.tutorial-brand small { color: #4f5969; font-size: 0.95rem; font-weight: 700; }

.tutorial-header nav { display: flex; align-items: center; gap: 8px; }
.tutorial-header nav a {
    min-height: 44px;
    padding: 0 18px;
    display: inline-flex;
    align-items: center;
    border-radius: 12px;
    color: #404a59;
    font-weight: 700;
    text-decoration: none;
    transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}
.tutorial-header nav a:hover { color: var(--tutorial-red); background: #fff1f2; }
.tutorial-header nav a:active { transform: scale(0.97); }
.tutorial-header nav .is-primary { color: #fff; background: var(--tutorial-ink); }
.tutorial-header nav .is-primary:hover { color: #fff; background: #2b3442; }

.tutorial-main { padding: 0 0 72px; }
.tutorial-intro,
.tutorial-search-area,
.tutorial-sections { width: min(1180px, calc(100% - 48px)); margin-inline: auto; }
.tutorial-intro { padding: 38px 0 24px; }
.tutorial-intro.tutorial-section > header { margin-bottom: 20px; }
.tutorial-intro h1 {
    margin: 6px 0 0;
    font-family: "Plus Jakarta Sans", sans-serif;
    font-size: clamp(1.9rem, 4vw, 2.75rem);
    line-height: 1.08;
    letter-spacing: -0.04em;
}
.tutorial-search-area {
    margin-top: 22px;
    padding: 18px 20px 12px;
    border: 1px solid var(--tutorial-line);
    border-radius: 18px;
    background: #fff;
    box-shadow: 0 8px 28px rgba(25, 32, 45, 0.05);
}

.tutorial-search-shell {
    width: 100%;
    height: 56px;
    padding: 0 17px;
    display: flex;
    align-items: center;
    gap: 14px;
    border: 1px solid #d8dde6;
    border-radius: 13px;
    background: #f8f9fb;
}
.tutorial-search-shell:focus-within { outline: 3px solid rgba(239, 7, 22, 0.28); }
.tutorial-search-shell svg { width: 23px; fill: none; stroke: #737d8c; stroke-linecap: round; stroke-width: 2; }
.tutorial-search-shell input { min-width: 0; flex: 1; border: 0; outline: 0; color: var(--tutorial-ink); font-size: 1.08rem; font-weight: 600; background: transparent; }
.tutorial-search-shell input::placeholder { color: #969eab; }
.tutorial-search-shell kbd { padding: 5px 10px; border: 1px solid #dce0e7; border-radius: 8px; color: #737d8c; background: #f6f7f9; font: 700 0.8rem "DM Sans", sans-serif; }
.tutorial-search-meta { min-height: 25px; margin-top: 8px; display: flex; align-items: center; gap: 16px; color: #7e8898; font-size: 0.85rem; }
.tutorial-search-meta button { padding: 0; border: 0; color: var(--tutorial-red); font-weight: 700; text-decoration: underline; background: transparent; cursor: pointer; }

.tutorial-section { padding: 48px 0 6px; }
.tutorial-section.tutorial-intro { padding: 34px 0 18px; }
.tutorial-section > header { margin-bottom: 30px; display: grid; grid-template-columns: minmax(280px, 0.8fr) minmax(340px, 1fr); align-items: end; gap: 40px; }
.tutorial-section > header span { color: var(--tutorial-red); font-size: 0.76rem; font-weight: 800; letter-spacing: 0.15em; text-transform: uppercase; }
.tutorial-section h2 { margin: 8px 0 0; font-family: "Plus Jakarta Sans", sans-serif; font-size: clamp(1.8rem, 4vw, 2.7rem); letter-spacing: -0.035em; }
.tutorial-section > header p { max-width: 650px; margin: 0; color: var(--tutorial-muted); font-size: 1.02rem; line-height: 1.65; }

.tutorial-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.tutorial-grid.has-featured-video { grid-template-columns: 1fr; }
.tutorial-card { min-width: 0; overflow: hidden; border: 1px solid var(--tutorial-line); border-radius: 20px; background: #fff; box-shadow: 0 8px 28px rgba(25, 32, 45, 0.05); transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease; }
.tutorial-card:hover { transform: translateY(-5px); border-color: #f4aeb3; box-shadow: 0 18px 44px rgba(25, 32, 45, 0.12); }
.tutorial-card-action { width: 100%; height: 100%; padding: 0; display: flex; flex-direction: column; border: 0; color: inherit; text-align: left; background: transparent; cursor: pointer; }
.tutorial-thumbnail { aspect-ratio: 16 / 9; display: block; position: relative; overflow: hidden; background: #1a202b; }
.tutorial-thumbnail::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 50%, rgba(5, 7, 10, 0.45)); transition: background 200ms ease; }
.tutorial-thumbnail img { width: 100%; height: 100%; display: block; object-fit: cover; transition: transform 360ms ease; }
.tutorial-card:hover .tutorial-thumbnail img { transform: scale(1.035); }
.tutorial-play { width: 58px; height: 58px; display: grid; place-items: center; position: absolute; z-index: 2; left: 50%; top: 50%; transform: translate(-50%, -50%); border-radius: 50%; color: #fff; background: var(--tutorial-red); box-shadow: 0 12px 30px rgba(229, 9, 20, 0.38); transition: transform 180ms ease; }
.tutorial-card:hover .tutorial-play { transform: translate(-50%, -50%) scale(1.09); }
.tutorial-play svg { width: 28px; fill: currentColor; }
.tutorial-thumbnail em { position: absolute; right: 16px; bottom: 14px; z-index: 2; color: #fff; font-size: 0.78rem; font-style: normal; font-weight: 700; }
.tutorial-card-copy { padding: 23px 24px 25px; display: flex; flex: 1; flex-direction: column; }
.tutorial-card-copy small { color: var(--tutorial-red); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.09em; text-transform: uppercase; }
.tutorial-card-copy strong { margin-top: 8px; font-family: "Plus Jakarta Sans", sans-serif; font-size: 1.22rem; line-height: 1.3; letter-spacing: -0.02em; }
.tutorial-card-copy > span { margin-top: 11px; color: var(--tutorial-muted); line-height: 1.55; }
.tutorial-card-copy b { margin-top: auto; padding-top: 20px; display: flex; align-items: center; gap: 8px; color: var(--tutorial-ink); font-size: 0.88rem; }
.tutorial-card-copy b svg { width: 18px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2; transition: transform 160ms ease; }
.tutorial-card:hover .tutorial-card-copy b svg { transform: translateX(4px); }

.tutorial-card.is-featured .tutorial-card-action { display: grid; grid-template-columns: minmax(320px, 0.72fr) minmax(360px, 1fr); }
.tutorial-card.is-featured .tutorial-thumbnail { height: auto; min-height: 0; aspect-ratio: 16 / 8; }
.tutorial-card.is-featured .tutorial-card-copy { padding: clamp(26px, 3.5vw, 44px); justify-content: center; }
.tutorial-card.is-featured .tutorial-card-copy strong { font-size: clamp(1.45rem, 2.5vw, 2rem); }
.tutorial-card.is-featured .tutorial-card-copy > span { max-width: 560px; font-size: 1rem; }
.tutorial-card.is-featured .tutorial-card-copy b { margin-top: 12px; }

.tutorial-empty { width: min(720px, calc(100% - 48px)); margin: 80px auto 0; padding: 64px 30px; border: 1px solid var(--tutorial-line); border-radius: 22px; text-align: center; background: #fff; }
.tutorial-empty > span { width: 58px; height: 58px; margin: 0 auto 18px; display: grid; place-items: center; border-radius: 16px; color: var(--tutorial-red); background: #fff0f1; }
.tutorial-empty svg { width: 25px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-width: 2; }
.tutorial-empty h2 { margin: 0; font-family: "Plus Jakarta Sans", sans-serif; }
.tutorial-empty p { margin: 12px 0 0; color: var(--tutorial-muted); line-height: 1.6; }
.tutorial-empty button { padding: 0; border: 0; color: var(--tutorial-red); font-weight: 700; text-decoration: underline; background: none; cursor: pointer; }

.tutorial-footer { min-height: 110px; padding: 26px max(24px, calc((100vw - 1240px) / 2)); display: flex; align-items: center; gap: 18px; color: #aeb5c1; background: #111620; }
.tutorial-footer p { margin: 0 auto 0 0; }
.tutorial-footer a { color: #fff; font-weight: 700; text-decoration: none; }
.tutorial-footer a:hover { text-decoration: underline; }

.tutorial-player { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 28px; }
.tutorial-player-backdrop { position: absolute; inset: 0; border: 0; background: rgba(8, 11, 16, 0.78); backdrop-filter: blur(9px); cursor: default; }
.tutorial-player > section { width: min(1050px, 100%); max-height: calc(100vh - 56px); position: relative; overflow: auto; border: 1px solid rgba(255, 255, 255, 0.13); border-radius: 22px; color: #fff; background: #141a24; box-shadow: 0 35px 100px rgba(0, 0, 0, 0.48); animation: tutorial-player-in 220ms cubic-bezier(.2,.8,.2,1); }
@keyframes tutorial-player-in { from { opacity: 0; transform: translateY(18px) scale(0.975); } }
.tutorial-player > section > header { min-height: 88px; padding: 18px 22px 18px 28px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.tutorial-player header span { color: #ff626d; font-size: 0.68rem; font-weight: 800; letter-spacing: 0.14em; }
.tutorial-player h2 { margin: 5px 0 0; font-family: "Plus Jakarta Sans", sans-serif; font-size: clamp(1.05rem, 2.5vw, 1.5rem); }
.tutorial-player [data-tutorial-close]:not(.tutorial-player-backdrop) { width: 44px; height: 44px; flex: 0 0 auto; display: grid; place-items: center; border: 1px solid rgba(255, 255, 255, 0.14); border-radius: 50%; color: #fff; background: rgba(255, 255, 255, 0.06); cursor: pointer; }
.tutorial-player [data-tutorial-close] svg { width: 20px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-width: 2; }
.tutorial-player-frame { aspect-ratio: 16 / 9; background: #05070a; }
.tutorial-player-frame iframe { width: 100%; height: 100%; display: block; border: 0; }
.tutorial-player > section > footer { padding: 18px 28px 22px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.tutorial-player footer p { margin: 0; color: #9da6b5; font-size: 0.9rem; }
.tutorial-player footer a { display: inline-flex; align-items: center; gap: 7px; color: #fff; font-weight: 700; text-decoration: none; white-space: nowrap; }
.tutorial-player footer svg { width: 18px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 2; }
body.has-tutorial-player { overflow: hidden; }

@media (max-width: 900px) {
    .tutorial-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .tutorial-card.is-featured .tutorial-card-action { grid-template-columns: 1fr 1fr; }
    .tutorial-section > header { grid-template-columns: 1fr; gap: 14px; }
}

@media (max-width: 680px) {
    html { scroll-padding-top: 76px; }
    .tutorial-header { min-height: 66px; padding: 10px 16px; }
    .tutorial-brand { gap: 8px; }
    .tutorial-brand strong { font-size: 1.08rem; }
    .tutorial-brand i { height: 21px; }
    .tutorial-brand small { font-size: 0.8rem; }
    .tutorial-header nav a { min-height: 42px; padding: 0 13px; }
    .tutorial-header nav a:first-child { display: none; }
    .tutorial-main { padding-bottom: 54px; }
    .tutorial-intro,
    .tutorial-search-area,
    .tutorial-sections { width: calc(100% - 28px); }
    .tutorial-intro { padding: 28px 0 12px; }
    .tutorial-intro.tutorial-section > header { margin-bottom: 16px; }
    .tutorial-search-area { margin-top: 18px; padding: 12px 12px 8px; border-radius: 15px; }
    .tutorial-search-shell { height: 54px; border-radius: 12px; }
    .tutorial-search-shell kbd { display: none; }
    .tutorial-section { padding-top: 42px; }
    .tutorial-section > header { margin-bottom: 22px; }
    .tutorial-grid { grid-template-columns: 1fr; gap: 16px; }
    .tutorial-card.is-featured .tutorial-card-action { display: flex; }
    .tutorial-card.is-featured .tutorial-thumbnail { min-height: 0; aspect-ratio: 16 / 7; }
    .tutorial-card.is-featured .tutorial-card-copy { padding: 18px 20px 20px; }
    .tutorial-card.is-featured .tutorial-card-copy small,
    .tutorial-card.is-featured .tutorial-card-copy > span { display: none; }
    .tutorial-card.is-featured .tutorial-card-copy strong { margin-top: 0; font-size: 1.18rem; }
    .tutorial-card.is-featured .tutorial-card-copy b { margin-top: 0; padding-top: 12px; }
    .tutorial-footer { padding: 30px 20px; flex-wrap: wrap; gap: 10px 14px; }
    .tutorial-footer p { width: 100%; order: 3; }
    .tutorial-player { padding: 0; align-items: end; }
    .tutorial-player > section { width: 100%; max-height: 94svh; border-radius: 22px 22px 0 0; }
    .tutorial-player > section > header { min-height: 82px; padding: 15px 16px 15px 20px; }
    .tutorial-player > section > footer { padding: 16px 20px 22px; align-items: flex-start; flex-direction: column; gap: 12px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}