/* ==========================================
   ISYARATKU - BELAJAR ALFABET
   ========================================== */

* {
    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);
    --card-gray: var(--color-mint);
}

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;
}

button, input {
    font: inherit;
}

button {
    cursor: pointer;
}

[hidden] {
    display: none !important;
}

/* HEADER */

.learn-header {
    width: 100%;
    height: 72px;
    padding: 0 5.5%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: white;
    border-bottom: 1px solid var(--border);
}

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

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

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

.learn-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;
}

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

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

/* MAIN */

.learn-main {
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    flex: 1;
}

/* INTRO */

.learn-intro {
    padding: 52px 5.5% 24px;
}

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

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

.intro-row {
    margin-top: 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.intro-row h1 {
    font-size: clamp(30px, 3.2vw, 45px);
    font-weight: 800;
    letter-spacing: -1.6px;
    line-height: 1.15;
}

.intro-row p {
    margin-top: 10px;
    font-size: 15px;
    line-height: 1.7;
    color: var(--gray);
}

.alphabet-count {
    min-width: 155px;
    padding: 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: var(--color-mint);
    border: 1px solid transparent;
    border-radius: 14px;
}

.alphabet-count strong {
    font-size: 18px;
    color: var(--color-primary-strong);
}

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

/* SEARCH & FILTER */

.alphabet-controls {
    padding: 8px 5.5% 0;
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-box {
    width: 300px;
    max-width: 100%;
    height: 44px;
    padding: 0 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid var(--color-border-strong);
    border-radius: 25px;
    background: white;
}

.search-box:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(8, 127, 140, 0.18);
}

.search-box span {
    color: var(--color-muted);
    font-size: 22px;
}

.search-box input {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
    background: transparent;
    font-size: 14px;
    color: var(--color-navy);
}

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

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
}

.filter {
    height: 44px;
    padding: 0 17px;
    border: 1px solid var(--color-border-strong);
    border-radius: 25px;
    background: white;
    color: var(--color-navy);
    font-size: 14px;
    transition: 0.2s ease;
    font-weight: 600;
}

.filter:hover {
    border-color: var(--color-primary);
    color: var(--color-primary-strong);
}

.filter.active {
    background: var(--color-primary);
    color: var(--color-surface);
    border-color: var(--color-primary);
}

/* INSTRUCTION */

.instruction {
    padding: 14px 5.5% 16px;
    color: var(--color-muted);
    font-size: 13px;
}

/* ALPHABET GRID */

.alphabet-section {
    padding: 0 5.5% 65px;
}

.alphabet-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 12px;
}

/* ALPHABET CARD */

.alphabet-card {
    position: relative;
    min-width: 0;
    min-height: 160px;
    display: flex;
    flex-direction: column;
    padding: 12px;
    color: var(--black);
    text-decoration: none;
    background: white;
    border: 1px solid var(--border);
    border-radius: 14px;
    overflow: hidden;
    transition:
        transform 0.25s ease,
        background 0.25s ease,
        color 0.25s ease,
        border-color 0.25s ease,
        box-shadow 0.25s ease;
}

.alphabet-card:hover,
.alphabet-card:focus-visible {
    background: var(--color-surface);
    color: var(--color-navy);
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: 0 10px 22px rgba(23, 49, 58, 0.12);
}

/* CARD HEADER */

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header strong {
    font-size: 25px;
    font-weight: 800;
    line-height: 1;
}

.card-arrow {
    width: 25px;
    height: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: var(--color-mint);
    color: var(--color-primary-strong);
    font-size: 14px;
    border-radius: 50%;
}

.alphabet-card:hover .card-arrow,
.alphabet-card:focus-visible .card-arrow {
    color: var(--color-surface);
    background: var(--color-primary);
}

/* GESTURE */

.gesture-image {
    position: relative;
    width: 100%;
    height: 112px;
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-gray);
    border-radius: 9px;
    overflow: hidden;
    transition: background 0.25s ease;
}

.alphabet-card:hover .gesture-image,
.alphabet-card:focus-visible .gesture-image {
    background: var(--color-surface-muted);
}

.gesture-image img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 8px;
}

.gesture-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--color-border-strong);
    text-align: center;
}

.gesture-placeholder svg {
    width: 33px;
    height: 33px;
}

.gesture-placeholder span {
    font-size: 12px;
    color: var(--color-muted);
}

/* HOVER OVERLAY */

.card-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 30px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.alphabet-card:hover .card-overlay,
.alphabet-card:focus-visible .card-overlay {
    opacity: 1;
}

.detail-label {
    padding: 10px 15px;
    border-radius: 25px;
    background: var(--color-primary);
    color: var(--color-surface);
    font-size: 13px;
    font-weight: 700;
    box-shadow: 0 5px 12px rgba(23, 49, 58, 0.15);
}

/* EMPTY STATE */

.empty-state {
    padding: 65px 20px;
    text-align: center;
}

.empty-state h2 {
    font-size: 20px;
}

.empty-state p {
    margin-top: 8px;
    color: var(--gray);
    font-size: 13px;
}

.empty-state button {
    margin-top: 18px;
    padding: 11px 20px;
    border: none;
    border-radius: 25px;
    background: var(--color-primary);
    color: white;
    font-size: 14px;
    font-weight: 600;
}

.empty-state button:hover {
    background: var(--color-primary-strong);
}

/* FOOTER */

.learn-footer {
    width: 100%;
    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;
    white-space: nowrap;
}

/* RESPONSIVE */

@media (max-width: 1100px) {
    .alphabet-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

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

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

@media (max-width: 700px) {
    .learn-header {
        height: auto;
        padding: 15px 5%;
        flex-direction: column;
        gap: 15px;
    }

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

    .learn-intro {
        padding: 35px 5% 22px;
    }

    .intro-row {
        flex-direction: column;
        align-items: flex-start;
    }

    .alphabet-controls {
        flex-direction: column;
        align-items: stretch;
        padding: 0 5%;
    }

    .search-box {
        width: 100%;
    }

    .instruction {
        padding-left: 5%;
        padding-right: 5%;
    }

    .alphabet-section {
        padding: 0 5% 45px;
    }

    .alphabet-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .learn-footer {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .copyright {
        grid-column: auto;
    }
}

@media (max-width: 450px) {
    .intro-row h1 {
        font-size: 29px;
    }

    .alphabet-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .alphabet-card {
        min-height: 155px;
        padding: 10px;
    }

    .gesture-image {
        height: 108px;
    }
}

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

/* =========================================
   STATUS BELAJAR (revisi UI)
   ========================================= */

.learn-progress {
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 240px;
    padding: 16px 18px;
    border: 1px solid var(--color-border);
    border-radius: 16px;
    background: white;
    box-shadow: var(--shadow-card);
}

.learn-progress-top {
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.learn-progress-top strong {
    color: var(--color-primary-strong);
    font-size: 24px;
    line-height: 1;
}

.learn-progress-top span,
.learn-progress small {
    color: var(--color-muted);
    font-size: 13px;
}

.instruction {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.instruction .legend {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.card-header .status-badge {
    padding: 2px 8px;
    font-size: 10px;
}

/* Huruf yang belum dipelajari diberi garis aksen di atas */
.alphabet-card[data-status="new"] {
    border-top: 3px solid var(--color-accent);
}

.alphabet-card[data-status="practiced"] {
    border-color: var(--color-primary);
    background: linear-gradient(180deg, var(--color-mint), white 45%);
}

@media (max-width: 700px) {
    .intro-row {
        flex-direction: column;
        align-items: stretch;
    }

    .learn-progress {
        min-width: 0;
    }
}