/**
 * App CSS — BelajarABK
 * Design System: ABK-Friendly, Colorful, Accessible
 */

@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&display=swap');

:root {
    --primary: #6C63FF;
    --secondary: #FF6584;
    --success: #4ECDC4;
    --warning: #FFE66D;
    --info: #74B9FF;
    --danger: #FF4757;
    --dark: #2D3436;
    --light: #F0F4FF;
    --font: 'Nunito', sans-serif;
    --radius: 20px;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-hover: 0 10px 35px rgba(0,0,0,0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================
   BASE
   ============================ */
*, *::before, *::after { box-sizing: border-box; }

body {
    font-family: var(--font);
    color: var(--dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 { font-weight: 800; }

/* ============================
   UTILITIES
   ============================ */
.fw-900 { font-weight: 900 !important; }
.fw-800 { font-weight: 800 !important; }
.fw-700 { font-weight: 700 !important; }

.text-gradient {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%) !important;
}

/* ============================
   CARDS ABK
   ============================ */
.card-abk {
    background: #fff;
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(0,0,0,0.04);
    transition: var(--transition);
}

.card-abk:hover {
    box-shadow: var(--shadow-hover);
}

/* ============================
   BUTTONS ABK - Large & Accessible
   ============================ */
.btn-abk {
    min-height: 52px;
    border-radius: 14px;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 800;
    font-family: var(--font);
    border: none;
    transition: var(--transition);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    letter-spacing: 0.3px;
}

.btn-abk:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.btn-abk:active { transform: translateY(0); }

.btn-abk-primary {
    background: linear-gradient(135deg, var(--primary), #5a52d5);
    color: #fff;
    box-shadow: 0 6px 20px rgba(108,99,255,0.35);
}

.btn-abk-secondary {
    background: linear-gradient(135deg, var(--secondary), #e85d7a);
    color: #fff;
    box-shadow: 0 6px 20px rgba(255,101,132,0.35);
}

.btn-abk-success {
    background: linear-gradient(135deg, var(--success), #00b894);
    color: #fff;
    box-shadow: 0 6px 20px rgba(78,205,196,0.35);
}

.btn-abk-warning {
    background: linear-gradient(135deg, #fdcb6e, var(--warning));
    color: var(--dark);
    box-shadow: 0 6px 20px rgba(255,230,109,0.35);
}

/* ============================
   PROGRESS BARS
   ============================ */
.progress-bar-abk {
    height: 14px;
    border-radius: 20px;
    background: #E8ECEF;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    border-radius: 20px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.35) 50%, transparent 100%);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ============================
   MATERI CARDS
   ============================ */
.materi-card {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
    color: inherit;
    display: block;
}

.materi-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(108,99,255,0.2);
    color: inherit;
}

.materi-thumbnail {
    height: 140px;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.materi-thumbnail img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.materi-card:hover .materi-thumbnail img {
    transform: scale(1.05);
}

/* ============================
   BADGE CARDS
   ============================ */
.badge-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 12px;
}

.badge-item {
    text-align: center;
    padding: 14px 8px;
    border-radius: 16px;
    background: #F8F9FF;
    border: 2px solid transparent;
    transition: var(--transition);
    cursor: default;
}

.badge-item.earned {
    background: linear-gradient(135deg, #fff9c4, #fffde7);
    border-color: var(--warning);
    box-shadow: 0 4px 15px rgba(255,230,109,0.25);
}

.badge-item.earned:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 25px rgba(255,230,109,0.35);
}

.badge-item-icon { font-size: 2rem; margin-bottom: 6px; line-height: 1; }
.badge-item-name { font-size: 0.72rem; font-weight: 700; color: #636e72; line-height: 1.2; }

/* ============================
   STREAK ANIMATION
   ============================ */
.streak-fire {
    animation: fireAnim 1s ease-in-out infinite alternate;
    display: inline-block;
}

@keyframes fireAnim {
    from { transform: scale(1) rotate(-5deg); }
    to { transform: scale(1.15) rotate(5deg); }
}

/* ============================
   FLASHCARD
   ============================ */
.flashcard {
    width: 100%;
    aspect-ratio: 4/3;
    perspective: 1000px;
    cursor: pointer;
    max-width: 360px;
    margin: 0 auto;
}

.flashcard-inner {
    position: relative;
    width: 100%; height: 100%;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
    position: absolute;
    inset: 0;
    border-radius: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    padding: 24px;
}

.flashcard-front {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    font-size: 4rem;
    box-shadow: 0 10px 40px rgba(108,99,255,0.3);
}

.flashcard-back {
    background: linear-gradient(135deg, var(--success), #00b894);
    color: #fff;
    transform: rotateY(180deg);
    font-size: 1.5rem;
    font-weight: 900;
    text-align: center;
}

/* ============================
   MISSION CARDS
   ============================ */
.mission-card {
    border-radius: 16px;
    padding: 16px;
    border: 2px solid #E8ECEF;
    background: #fff;
    transition: var(--transition);
}

.mission-card.completed {
    background: linear-gradient(135deg, #e8f8f5, #d5f5e3);
    border-color: var(--success);
}

.mission-card:hover {
    border-color: rgba(108,99,255,0.3);
    transform: translateY(-2px);
}

/* ============================
   AUDIO PLAYER CUSTOM
   ============================ */
.audio-player {
    background: linear-gradient(135deg, var(--dark), #1e272e);
    border-radius: 20px;
    padding: 20px;
    color: #fff;
}

.audio-btn {
    width: 56px; height: 56px;
    border-radius: 50%;
    background: var(--primary);
    border: none;
    color: #fff;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(108,99,255,0.4);
}

.audio-btn:hover { transform: scale(1.1); }

/* ============================
   QUIZ OPTIONS
   ============================ */
.option-btn {
    border: 2px solid #E8ECEF !important;
    background: #F8F9FF !important;
    border-radius: 14px !important;
    padding: 16px !important;
    font-weight: 700 !important;
    font-family: var(--font) !important;
    transition: var(--transition) !important;
    width: 100%;
    text-align: left;
    cursor: pointer;
    font-size: 1rem;
}

.option-btn:hover {
    border-color: var(--primary) !important;
    background: rgba(108,99,255,0.05) !important;
    transform: translateX(4px);
}

.option-btn.selected {
    border-color: var(--primary) !important;
    background: linear-gradient(135deg, rgba(108,99,255,0.1), rgba(108,99,255,0.05)) !important;
}

.option-btn.correct {
    border-color: var(--success) !important;
    background: rgba(78,205,196,0.1) !important;
}

.option-btn.wrong {
    border-color: var(--danger) !important;
    background: rgba(255,71,87,0.1) !important;
}

/* ============================
   AVATAR
   ============================ */
.avatar-circle {
    width: 70px; height: 70px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 900;
    color: #fff;
    border: 4px solid #fff;
    box-shadow: 0 4px 15px rgba(108,99,255,0.3);
    overflow: hidden;
    flex-shrink: 0;
}

.avatar-circle img { width: 100%; height: 100%; object-fit: cover; }

/* ============================
   RESPONSIVE
   ============================ */
@media (max-width: 576px) {
    .btn-abk { min-height: 48px; padding: 10px 20px; font-size: 0.95rem; }
    .card-abk { padding: 18px; }
    .materi-thumbnail { height: 120px; }
}