/* ===========================
   CSS Variables & Design System
   =========================== */
:root {
    /* Colors - Islamic-inspired palette */
    --primary: #0d7c66;
    --primary-light: #17a589;
    --primary-dark: #095e4e;
    --primary-glow: rgba(13, 124, 102, 0.3);
    
    --gold: #c9a227;
    --gold-light: #e6c44d;
    --gold-dark: #9e7e1c;
    --gold-glow: rgba(201, 162, 39, 0.25);
    
    --bg-dark: #0a0f1a;
    --bg-card: #111827;
    --bg-card-hover: #1a2332;
    --bg-surface: #151d2e;
    --bg-overlay: rgba(10, 15, 26, 0.95);
    
    --text-primary: #e8e6e3;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --text-accent: #c9a227;
    
    --border-color: rgba(201, 162, 39, 0.15);
    --border-subtle: rgba(255, 255, 255, 0.06);
    
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
    --shadow-glow: 0 0 20px var(--primary-glow);
    --shadow-gold: 0 0 20px var(--gold-glow);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    --font-arabic: 'Tajawal', 'Noto Naskh Arabic', sans-serif;
    --font-quran: 'Amiri', 'Noto Naskh Arabic', serif;
    
    --transition-fast: 0.2s ease;
    --transition-med: 0.4s ease;
    --transition-slow: 0.6s ease;
}

/* ===========================
   Reset & Base
   =========================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-arabic);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.8;
    direction: rtl;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-dark);
}
::-webkit-scrollbar-thumb {
    background: var(--primary-dark);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* ===========================
   Page System
   =========================== */
.page {
    display: none;
    min-height: 100vh;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.page.active {
    display: flex;
    flex-direction: column;
    opacity: 1;
    transform: translateY(0);
}

/* ===========================
   Landing Page
   =========================== */
#landing-page {
    justify-content: center;
    align-items: center;
    position: relative;
    background: 
        radial-gradient(ellipse at 50% 0%, rgba(13, 124, 102, 0.15) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 80%, rgba(201, 162, 39, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 20% 90%, rgba(13, 124, 102, 0.08) 0%, transparent 50%),
        var(--bg-dark);
    overflow: hidden;
}

/* Stars */
.stars-container {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.star {
    position: absolute;
    width: 3px;
    height: 3px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: twinkle var(--duration, 3s) ease-in-out infinite;
    animation-delay: var(--delay, 0s);
}

@keyframes twinkle {
    0%, 100% { opacity: 0.2; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1.2); }
}

.landing-content {
    text-align: center;
    padding: 2rem;
    max-width: 700px;
    z-index: 2;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Ornaments */
.landing-ornament {
    color: var(--gold);
    opacity: 0.5;
    margin: 1.5rem 0;
}
.ornament-svg {
    width: 200px;
    height: 40px;
}
.top-ornament {
    animation: fadeIn 1.2s ease-out 0.2s both;
}
.bottom-ornament {
    animation: fadeIn 1.2s ease-out 0.8s both;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 0.5; }
}

.bismillah {
    font-family: var(--font-quran);
    font-size: 1.5rem;
    color: var(--gold);
    margin-bottom: 2rem;
    letter-spacing: 2px;
    animation: fadeInUp 1s ease-out 0.3s both;
    text-shadow: 0 0 30px var(--gold-glow);
}

.landing-title {
    margin-bottom: 1.5rem;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.title-line {
    display: block;
    font-family: var(--font-quran);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.4;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--gold-light) 50%, var(--text-primary) 100%);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 4s ease-in-out infinite;
}

.title-line-sub {
    display: block;
    font-family: var(--font-quran);
    font-size: 1.8rem;
    color: var(--gold);
    line-height: 2;
    opacity: 0.8;
}

@keyframes shimmer {
    0%, 100% { background-position: 0% center; }
    50% { background-position: 200% center; }
}

.landing-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-weight: 300;
    letter-spacing: 0.5px;
    animation: fadeInUp 1s ease-out 0.5s both;
}

.verse-container {
    background: linear-gradient(135deg, rgba(201, 162, 39, 0.08), rgba(13, 124, 102, 0.08));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem 2rem;
    margin-bottom: 2.5rem;
    animation: fadeInUp 1s ease-out 0.6s both;
    backdrop-filter: blur(10px);
}

.quran-verse {
    font-family: var(--font-quran);
    font-size: 1.6rem;
    color: var(--gold-light);
    line-height: 2;
    text-shadow: 0 0 20px var(--gold-glow);
}

.verse-reference {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.start-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2.5rem;
    font-family: var(--font-arabic);
    font-size: 1.15rem;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-med);
    animation: fadeInUp 1s ease-out 0.7s both;
    position: relative;
    overflow: hidden;
}

.start-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: translateX(100%);
    transition: transform 0.6s;
}

.start-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow), var(--shadow-md);
}

.start-btn:hover::before {
    transform: translateX(-100%);
}

.start-btn:active {
    transform: translateY(-1px);
}

.arrow-icon {
    transition: transform var(--transition-fast);
}

.start-btn:hover .arrow-icon {
    transform: translateX(-5px);
}

/* ===========================
   Tree Page
   =========================== */
#tree-page {
    background: 
        radial-gradient(ellipse at 30% 0%, rgba(13, 124, 102, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 100%, rgba(201, 162, 39, 0.06) 0%, transparent 50%),
        var(--bg-dark);
    padding-bottom: 2rem;
}

.tree-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 2rem;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 10;
}

.tree-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
}

.tree-icon {
    color: var(--gold);
}

.back-home-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.2rem;
    font-family: var(--font-arabic);
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.back-home-btn:hover {
    color: var(--gold);
    border-color: var(--border-color);
    background: var(--bg-card-hover);
}

/* Tree Container */
.tree-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.25rem;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Topic Card */
.topic-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    cursor: pointer;
    transition: all var(--transition-med);
    overflow: hidden;
}

.topic-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary), var(--gold));
    opacity: 0;
    transition: opacity var(--transition-med);
}

.topic-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-color);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(13, 124, 102, 0.1);
    background: var(--bg-card-hover);
}

.topic-card:hover::before {
    opacity: 1;
}

.topic-card.read {
    border-color: rgba(13, 124, 102, 0.3);
}

.topic-card.read::after {
    content: '✓';
    position: absolute;
    top: 1rem;
    left: 1rem;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-size: 0.8rem;
    font-weight: 700;
}

.topic-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border-radius: 50%;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    box-shadow: 0 4px 12px rgba(13, 124, 102, 0.3);
}

.topic-card:nth-child(even) .topic-number {
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    box-shadow: 0 4px 12px var(--gold-glow);
}

.topic-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.topic-card-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.topic-card-icon {
    position: absolute;
    bottom: -10px;
    left: -10px;
    font-size: 4rem;
    opacity: 0.04;
    transition: opacity var(--transition-med);
}

.topic-card:hover .topic-card-icon {
    opacity: 0.08;
}

/* Progress */
.progress-section {
    padding: 1rem 2rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-card);
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--gold));
    border-radius: 10px;
    width: 0%;
    transition: width var(--transition-slow);
}

/* ===========================
   Content Page
   =========================== */
#content-page {
    background: var(--bg-dark);
}

.content-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 2rem;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(20px);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    font-family: var(--font-arabic);
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.back-btn:hover {
    color: var(--gold);
    border-color: var(--border-color);
}

.content-title {
    flex: 1;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--gold);
    text-align: center;
    line-height: 1.6;
}

.content-nav-arrows {
    display: flex;
    gap: 0.5rem;
}

.nav-arrow {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.nav-arrow:hover {
    color: var(--gold);
    border-color: var(--border-color);
    background: var(--bg-card-hover);
}

.nav-arrow:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Content Body */
.content-body {
    max-width: 800px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
    flex: 1;
    animation: fadeContentIn 0.5s ease-out;
}

@keyframes fadeContentIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.content-body h3 {
    font-family: var(--font-quran);
    font-size: 1.6rem;
    color: var(--gold);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
    text-align: center;
    line-height: 1.8;
}

.content-body p {
    font-size: 1.1rem;
    line-height: 2.2;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    text-align: justify;
}

.content-body .highlight-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, rgba(13, 124, 102, 0.06), rgba(201, 162, 39, 0.04));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    transition: all var(--transition-fast);
}

.content-body .highlight-item:hover {
    background: linear-gradient(135deg, rgba(13, 124, 102, 0.1), rgba(201, 162, 39, 0.06));
    transform: translateX(4px);
}

.highlight-bullet {
    color: var(--gold);
    font-size: 1.2rem;
    margin-top: 0.3rem;
    flex-shrink: 0;
}

.highlight-text {
    font-size: 1.05rem;
    line-height: 2;
    color: var(--text-primary);
}

.highlight-text .name {
    font-weight: 700;
    color: var(--primary-light);
}

.highlight-text .note {
    color: var(--text-muted);
    font-size: 0.9rem;
    display: block;
    margin-top: 0.25rem;
}

.content-body .hadith-box {
    background: linear-gradient(135deg, rgba(201, 162, 39, 0.08), rgba(13, 124, 102, 0.06));
    border-right: 4px solid var(--gold);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
}

.hadith-box .hadith-text {
    font-family: var(--font-quran);
    font-size: 1.15rem;
    line-height: 2.2;
    color: var(--gold-light);
}

.hadith-box .hadith-source {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

.content-body .section-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 2rem 0;
    color: var(--gold);
    opacity: 0.4;
}

.section-divider::before,
.section-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--gold);
}

.content-body .quran-box {
    background: linear-gradient(135deg, rgba(13, 124, 102, 0.1), rgba(13, 124, 102, 0.04));
    border-right: 4px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
}

.quran-box .quran-text {
    font-family: var(--font-quran);
    font-size: 1.3rem;
    line-height: 2.2;
    color: var(--primary-light);
}

.quran-box .quran-source {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Content Footer */
.content-footer {
    padding: 1.5rem 2rem;
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    border-top: 1px solid var(--border-subtle);
}

.mark-read-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 2rem;
    font-family: var(--font-arabic);
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-med);
}

.mark-read-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.mark-read-btn.completed {
    background: linear-gradient(135deg, var(--gold), var(--gold-dark));
    pointer-events: none;
}

.topic-navigation {
    display: flex;
    gap: 1rem;
    width: 100%;
    justify-content: space-between;
}

.topic-nav-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1.2rem;
    font-family: var(--font-arabic);
    font-size: 0.9rem;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.topic-nav-btn:hover {
    color: var(--gold);
    border-color: var(--border-color);
    background: var(--bg-card-hover);
}

.topic-nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 768px) {
    .title-line {
        font-size: 2.5rem;
    }
    .title-line-sub {
        font-size: 1.4rem;
    }
    .bismillah {
        font-size: 1.2rem;
    }
    .quran-verse {
        font-size: 1.3rem;
    }
    .tree-container {
        grid-template-columns: 1fr;
        padding: 1.5rem;
    }
    .tree-header {
        padding: 1rem 1.5rem;
        flex-wrap: wrap;
        gap: 0.75rem;
    }
    .tree-title {
        font-size: 1.1rem;
    }
    .content-header {
        padding: 1rem 1rem;
        flex-wrap: wrap;
    }
    .content-title {
        font-size: 1rem;
        order: 3;
        width: 100%;
    }
    .content-body {
        padding: 1.5rem 1.25rem;
    }
    .content-body h3 {
        font-size: 1.3rem;
    }
    .content-body p {
        font-size: 1rem;
    }
    .topic-navigation {
        flex-direction: column;
    }
    .landing-content {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .title-line {
        font-size: 2rem;
    }
    .verse-container {
        padding: 1rem 1.25rem;
    }
    .start-btn {
        padding: 0.85rem 2rem;
        font-size: 1rem;
    }
}