/* =========================================
   ISYARATKU - DETAIL HURUF
   ========================================= */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --black: var(--color-navy);
    --gray: var(--color-muted);
    --light: var(--color-bg);
    --white: var(--color-surface);
    --border: var(--color-border);
}

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: var(--font-sans);
    background: var(--light);
    color: var(--black);
    line-height: 1.5;
}

[hidden] {
    display: none !important;
}

/* HEADER */

.detail-header {
    height: 72px;
    padding: 0 5.5%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: white;
    border-bottom: 1px solid var(--border);
}

.detail-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--black);
    text-decoration: none;
    font-size: 15px;
    font-weight: 700;
}

.brand-icon {
    width: 31px;
    height: 31px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: white;
    border-radius: 9px;
    font-size: 12px;
    font-weight: 700;
}

.detail-nav {
    display: flex;
    align-items: center;
    gap: 7px;
}

.detail-nav a {
    padding: 9px 15px;
    border-radius: 25px;
    text-decoration: none;
    color: var(--color-navy);
    font-size: 14px;
    transition: 0.2s ease;
    font-weight: 600;
}

.detail-nav a:hover {
    background: var(--color-mint);
    color: var(--color-navy);
}

.detail-nav a.active {
    background: var(--color-primary);
    color: var(--color-surface);
}

/* MAIN */

.detail-main {
    width: 100%;
    max-width: 1500px;
    margin: 0 auto;
    padding: 55px 5.5% 65px;
    flex: 1;
}

.back-link {
    color: var(--color-primary-strong);
    font-size: 14px;
    text-decoration: none;
    font-weight: 600;
}

.back-link:hover {
    color: var(--color-navy);
}

/* CONTENT */

.detail-content {
    margin-top: 42px;
    display: grid;
    grid-template-columns: 1fr 1.05fr;
    gap: 45px;
    align-items: center;
}

/* GESTURE CARD */

.gesture-card {
    min-height: 510px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    background: white;
    border: 1px solid var(--border);
    border-radius: 24px;
    box-shadow: var(--shadow-card);
}

.gesture-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 15px;
}

.gesture-top h1 {
    font-size: clamp(60px, 6vw, 90px);
    font-weight: 800;
    line-height: 1;
    letter-spacing: -3px;
    color: var(--color-primary-strong);
}

.gesture-badge {
    margin-top: 3px;
    padding: 8px 11px;
    background: var(--color-mint);
    border-radius: 25px;
    font-size: 11px;
    font-weight: 700;
    color: var(--color-primary-strong);
    white-space: nowrap;
}

.gesture-preview {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 25px 0;
}

.gesture-image-box {
    position: relative;
    width: min(230px, 80%);
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-mint);
    border-radius: 26px;
    overflow: hidden;
}

.gesture-image-box img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 10px;
}

.gesture-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--color-border-strong);
}

.gesture-placeholder svg {
    width: 65px;
    height: 65px;
}

.gesture-placeholder span {
    font-size: 13px;
    color: var(--color-muted);
}

.gesture-letter-badge {
    position: absolute;
    right: 10px;
    bottom: 10px;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    font-weight: 700;
    font-size: 18px;
}

.gesture-caption {
    text-align: center;
    font-size: 13px;
    line-height: 1.5;
    color: var(--color-muted);
}

/* TUTORIAL */

.tutorial-content {
    width: 100%;
}

.eyebrow {
    display: block;
    margin-bottom: 15px;
    font-size: 12px;
    color: var(--color-primary-strong);
    font-weight: 700;
    letter-spacing: 1px;
}

.tutorial-content h2 {
    max-width: 650px;
    font-size: clamp(29px, 3vw, 43px);
    line-height: 1.12;
    letter-spacing: -1.5px;
    font-weight: 800;
}

.tutorial-description {
    max-width: 620px;
    margin-top: 18px;
    color: var(--gray);
    font-size: 15px;
    line-height: 1.8;
}

/* STEPS */

.tutorial-steps {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 25px;
}

.step-card {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 14px 16px;
    min-height: 70px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: white;
}

.step-number {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    font-size: 12px;
    font-weight: 700;
}

.step-text strong {
    display: block;
    font-size: 15px;
    font-weight: 700;
}

.step-text p {
    margin-top: 4px;
    color: var(--color-muted);
    font-size: 13px;
    line-height: 1.5;
}

/* PRACTICE BUTTON */

.practice-button {
    width: fit-content;
    margin-top: 25px;
    padding: 13px 20px;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    background: var(--color-primary);
    color: white;
    border-radius: 30px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: 0.2s ease;
    min-height: 46px;
}

.practice-button:hover {
    background: var(--color-primary-strong);
    transform: translateY(-2px);
}

/* LETTER NAVIGATION */

.letter-navigation {
    margin-top: 34px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.letter-nav-card {
    min-height: 70px;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 13px;
    border: 1px solid var(--border);
    border-radius: 13px;
    background: white;
    color: var(--black);
    text-decoration: none;
    transition: 0.2s ease;
}

.letter-nav-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.letter-nav-card.next {
    justify-content: flex-end;
}

.nav-arrow {
    width: 34px;
    height: 34px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-mint);
    font-size: 18px;
    color: var(--color-primary-strong);
}

.nav-arrow.dark {
    background: var(--color-primary);
    color: white;
}

.nav-text {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.nav-text small {
    color: var(--color-muted);
    font-size: 11px;
    font-weight: 700;
}

.nav-text strong {
    font-size: 16px;
}

.next .nav-text {
    align-items: flex-end;
}

/* FOOTER */

.detail-footer {
    min-height: 125px;
    padding: 25px 5.5%;
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 45px;
    background: var(--black);
    color: white;
}

.footer-about strong {
    font-size: 14px;
}

.footer-about p {
    max-width: 290px;
    margin-top: 7px;
    color: var(--color-on-dark-muted);
    font-size: 13px;
    line-height: 1.6;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
}

.footer-links a {
    color: var(--color-on-dark-muted);
    text-decoration: none;
    font-size: 13px;
}

.footer-links a:hover {
    color: var(--color-surface);
}

.copyright {
    color: var(--color-on-dark-muted);
    font-size: 12px;
}

/* RESPONSIVE */

@media (max-width: 1000px) {
    .detail-content {
        gap: 25px;
    }

    .gesture-card {
        min-height: 450px;
    }

    .detail-footer {
        grid-template-columns: 1fr auto;
    }

    .copyright {
        grid-column: 1 / -1;
    }
}

@media (max-width: 750px) {
    .detail-main {
        padding: 35px 5% 45px;
    }

    .detail-content {
        grid-template-columns: 1fr;
        gap: 32px;
        margin-top: 28px;
    }

    .gesture-card {
        min-height: 410px;
    }

    .tutorial-content h2 {
        font-size: 32px;
    }

    .detail-footer {
        grid-template-columns: 1fr;
        padding: 30px 5%;
        gap: 20px;
    }

    .copyright {
        grid-column: auto;
    }
}

@media (max-width: 500px) {
    .detail-header {
        height: auto;
        padding: 15px 5%;
        flex-direction: column;
        gap: 15px;
    }

    .detail-nav {
        justify-content: center;
        flex-wrap: wrap;
    }

    .detail-nav a {
        font-size: 13px;
        padding: 9px 11px;
    }

    .gesture-card {
        min-height: 350px;
        padding: 18px;
    }

    .gesture-top h1 {
        font-size: 60px;
    }

    .gesture-image-box {
        width: 190px;
    }

    .tutorial-content h2 {
        font-size: 29px;
    }

    .tutorial-description {
        font-size: 13px;
    }

    .letter-navigation {
        gap: 8px;
    }

    .letter-nav-card {
        padding: 10px;
        gap: 8px;
    }

    .nav-arrow {
        width: 28px;
        height: 28px;
    }

    .nav-text small {
        font-size: 10px;
    }
}

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

/* =========================================
   REVISI UI: FOTO LEBIH BESAR + STATUS
   ========================================= */

.gesture-image-box {
    width: min(360px, 92%);
    aspect-ratio: 4 / 5;
}

.gesture-image-box img {
    padding: 0;
    object-fit: cover;
}

.mastery {
    display: grid;
    gap: 10px;
    max-width: 620px;
    margin-top: 25px;
    padding: 16px 18px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: white;
}

.mastery-status {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 600;
}

.understand-button {
    display: flex;
    align-items: center;
    gap: 12px;
    min-height: 48px;
    padding: 10px 14px;
    border: 1.5px dashed var(--color-border-strong);
    border-radius: 12px;
    background: var(--color-bg);
    color: var(--color-navy);
    font: 700 15px var(--font-sans);
    text-align: left;
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.understand-button:hover:not(:disabled) {
    border-color: var(--color-primary);
    background: var(--color-mint);
}

.understand-box {
    display: grid;
    place-items: center;
    flex: none;
    width: 22px;
    height: 22px;
    border: 2px solid var(--color-border-strong);
    border-radius: 6px;
    background: white;
    color: white;
    font-size: 13px;
}

.understand-button[aria-pressed="true"] {
    border-style: solid;
    border-color: var(--color-success);
    background: var(--color-success-bg);
    color: var(--color-success);
    cursor: default;
}

.understand-button[aria-pressed="true"] .understand-box {
    border-color: var(--color-success);
    background: var(--color-success);
}

.understand-button[aria-pressed="true"] .understand-box::after {
    content: "✓";
}

.mastery-hint {
    color: var(--color-muted);
    font-size: 13px;
}

/* Setelah dipahami, tombol praktik menjadi ajakan utama */
.practice-button.is-ready {
    background: var(--color-navy);
    box-shadow: 0 0 0 4px rgba(244, 201, 93, 0.6);
    animation: ready-pulse 1.8s ease-in-out 2;
}

@keyframes ready-pulse {
    50% { box-shadow: 0 0 0 9px rgba(244, 201, 93, 0.15); }
}