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

:root {
    --primary-color: #e67e22;
    --primary-hover: #d35400;
    --bg-gradient-1: #0f1115;
    --bg-gradient-2: #1e1220;
    --surface-color: rgba(30, 33, 38, 0.95);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-color: #f8f9fa;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.3);
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s ease;
    --success-color: #2ecc71;
    --error-color: #e74c3c;
    --warning-color: #f1c40f;
    --info-color: #3498db;
    --border-radius: 14px;
}

body.light-mode {
    --primary-color: #f39c12;
    --primary-hover: #e67e22;
    --bg-gradient-1: #ffffff;
    --bg-gradient-2: #f0f4f8;
    --surface-color: rgba(255, 255, 255, 0.98);
    --border-color: rgba(0, 0, 0, 0.08);
    --text-color: #1a202c;
    --glass-bg: rgba(255, 255, 255, 0.85);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.06);
}

body.light-mode .bg-animation .shape {
    opacity: 0.08;
}

body.light-mode header,
body.light-mode footer {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(248, 249, 250, 0.95));
}

body.light-mode .question-card,
body.light-mode #question-navigator {
    background: rgba(255, 255, 255, 0.9);
}

body.light-mode .option-label {
    background: #f8f9fa;
}

body.light-mode .mm-node,
body.light-mode .mm-leaf {
    background: rgba(0, 0, 0, 0.05);
}

body.pro-mode {
    --primary-color: #e67e22;
    --primary-hover: #ff9f43;
    --bg-gradient-1: #0f2027;
    --bg-gradient-2: #203a43;
    --surface-color: rgba(15, 32, 39, 0.95);
    --border-color: rgba(255, 255, 255, 0.12);
    --text-color: #ecf0f1;
    --glass-bg: rgba(15, 32, 39, 0.85);
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
}

body.pro-mode header,
body.pro-mode footer {
    background: rgba(15, 32, 39, 0.9);
    backdrop-filter: blur(20px);
}

body.pro-mode .question-card,
body.pro-mode #question-navigator,
body.pro-mode .exam-instructions {
    background: rgba(15, 32, 39, 0.85);
    border-color: rgba(255, 255, 255, 0.1);
}

body.pro-mode .option-label {
    background: rgba(32, 58, 67, 0.6);
}

body.pro-mode .theme-menu {
    background: rgba(15, 32, 39, 0.95);
}

body.pro-mode header h1,
body.pro-mode header h1 span {
    background: linear-gradient(to right, #e67e22, #f1c40f);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

body.contrast-mode {
    --primary-color: #f1c40f;
    --primary-hover: #f39c12;
    --bg-gradient-1: #000000;
    --bg-gradient-2: #111111;
    --surface-color: #1a1a1a;
    --border-color: #333333;
    --text-color: #ffffff;
    --glass-bg: rgba(20, 20, 20, 0.95);
}

body.contrast-mode header h1 {
    color: #f1c40f;
}

body.contrast-mode header h1 span {
    color: #ffffff;
}

body.contrast-mode #submit-btn {
    background: #f1c40f;
    color: #000;
}

@keyframes gradientBG {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Cairo', sans-serif;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-gradient-1), var(--bg-gradient-2));
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background 0.4s ease, color 0.3s ease;
}

#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-gradient-1), var(--bg-gradient-2));
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

#loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 15px;
}

.loader-content {
    text-align: center;
}

.loader-content h2 {
    color: var(--text-color);
    font-size: 1.3rem;
    margin-bottom: 5px;
}

.loader-content p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

#confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 3000;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    top: -10px;
    animation: confetti-fall 3s linear forwards;
}

@keyframes confetti-fall {
    0% {
        transform: translateY(0) rotate(0);
        opacity: 1;
    }

    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
    pointer-events: none;
}

.shape {
    position: absolute;
    opacity: 0.05;
}

.shape.circle {
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), #3498db);
}

.shape.square {
    background: linear-gradient(135deg, #e74c3c, var(--primary-color));
}

.shape-1 {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation: float 6s ease-in-out infinite;
}

.shape-2 {
    width: 100px;
    height: 100px;
    top: 60%;
    right: 15%;
    animation: float-alt 8s ease-in-out infinite;
}

.shape-3 {
    width: 60px;
    height: 60px;
    top: 40%;
    right: 30%;
    animation: float 7s ease-in-out infinite 1s;
}

.shape-4 {
    width: 90px;
    height: 90px;
    bottom: 20%;
    left: 20%;
    animation: float 10s ease-in-out infinite 1.5s;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) rotate(0);
    }

    50% {
        transform: translateY(-15px) rotate(5deg);
    }
}

@keyframes float-alt {

    0%,
    100% {
        transform: translateY(0) rotate(0);
    }

    50% {
        transform: translateY(15px) rotate(-5deg);
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes blink {
    50% {
        opacity: 0.5;
    }
}

@keyframes correctPulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.01);
    }

    100% {
        transform: scale(1);
    }
}

#landing-page {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    /* Safe centering for scrollable content */
    z-index: 500;
    padding: 15px;
    overflow-y: auto;
}

.landing-container {
    max-width: 900px;
    width: 100%;
    text-align: center;
    margin: auto;
    /* Centers content when it fits, allows scroll when it doesn't */
}

.back-to-home {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    opacity: 0.7;
    margin-bottom: 16px;
    padding: 8px 18px;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    background: var(--glass-bg);
    transition: all 0.3s ease;
}

.back-to-home:hover {
    opacity: 1;
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateX(4px);
}

.landing-header {
    margin-bottom: 25px;
    animation: slideUp 0.5s ease-out;
}

.landing-header h1 {
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.landing-header h1 i {
    color: var(--primary-color);
    margin-left: 8px;
}

.landing-header p {
    font-size: 1rem;
    opacity: 0.8;
}

.mode-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.mode-card {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 25px 18px;
    cursor: pointer;
    transition: var(--transition-smooth);
    animation: scaleIn 0.4s ease-out backwards;
}

.mode-card:nth-child(1) {
    animation-delay: 0.1s;
}

.mode-card:nth-child(2) {
    animation-delay: 0.15s;
}

.mode-card:nth-child(3) {
    animation-delay: 0.2s;
}

.mode-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.practice-card:hover {
    border-color: var(--info-color);
}

.exam-card:hover {
    border-color: var(--primary-color);
}

.mindmap-card:hover {
    border-color: var(--success-color);
}

.card-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 15px;
    background: var(--surface-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: var(--transition-fast);
}

.practice-card .card-icon {
    color: var(--info-color);
    background: rgba(52, 152, 219, 0.15);
}

.exam-card .card-icon {
    color: var(--primary-color);
    background: rgba(230, 126, 34, 0.15);
}

.mindmap-card .card-icon {
    color: var(--success-color);
    background: rgba(46, 204, 113, 0.15);
}

.mode-card:hover .card-icon {
    transform: scale(1.1);
}

.mode-card h2 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.mode-card>p {
    font-size: 0.85rem;
    opacity: 0.8;
    margin-bottom: 12px;
    min-height: 40px;
}

.card-features {
    list-style: none;
    text-align: right;
    margin-bottom: 15px;
}

.card-features li {
    padding: 5px 0;
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-features li i {
    width: 16px;
    color: var(--success-color);
    font-size: 0.7rem;
}

.exam-card .card-features li i {
    color: var(--primary-color);
}

.card-btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    font-family: 'Cairo', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.practice-btn {
    background: linear-gradient(135deg, var(--info-color), #2980b9);
    color: white;
}

.exam-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
}

.mindmap-btn {
    background: linear-gradient(135deg, var(--success-color), #27ae60);
    color: white;
}

.card-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.landing-theme-switcher {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    animation: slideUp 0.6s ease-out 0.3s backwards;
}

.landing-theme-switcher span {
    opacity: 0.7;
    font-size: 0.85rem;
}

.landing-theme-switcher button {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: var(--glass-bg);
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.landing-theme-switcher button:hover {
    background: var(--primary-color);
    color: white;
}

#mindmap-page {
    min-height: 100vh;
    padding: 15px;
    padding-top: 80px;
}

.mindmap-page-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 15px;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.mindmap-page-header h1 {
    font-size: 1.1rem;
    /* flex: 1; Removed to fix alignment */
}

.mindmap-page-header h1 i {
    color: var(--primary-color);
    margin-left: 8px;
}

.mindmap-tabs-header {
    display: flex;
    gap: 8px;
}

.tab-btn {
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-color);
    border-radius: 8px;
    cursor: pointer;
    font-family: 'Cairo', sans-serif;
    font-weight: 600;
    font-size: 0.8rem;
    transition: var(--transition-fast);
}

.tab-btn:hover {
    border-color: var(--primary-color);
}

.tab-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.mindmap-content {
    max-width: 800px;
    margin: 0 auto;
}

.mindmap-tab-content {
    display: none;
    animation: slideUp 0.4s ease-out;
}

.mindmap-tab-content.active {
    display: block;
}

.mindmap-tree {
    padding: 10px 0;
}

.mm-root {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: 15px 25px;
    border-radius: var(--border-radius);
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.2rem;
    font-weight: 700;
    box-shadow: 0 5px 20px rgba(230, 126, 34, 0.3);
}

.mm-branches {
    padding-right: 15px;
}

.mm-branch {
    margin-bottom: 12px;
}

.mm-node {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 12px 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 600;
    font-size: 0.95rem;
}

.mm-node:hover {
    border-color: var(--primary-color);
    background: rgba(230, 126, 34, 0.1);
}

.mm-node i {
    transition: transform 0.3s ease;
    color: var(--primary-color);
    font-size: 0.8rem;
}

.mm-node.collapsed i {
    transform: rotate(-90deg);
}

.mm-level1 {
    border-right: 3px solid var(--primary-color);
}

.mm-level2 {
    border-right: 3px solid var(--info-color);
    margin-right: 20px;
}

.mm-children {
    padding-right: 25px;
    margin-top: 8px;
    border-right: 2px dashed var(--border-color);
    margin-right: 10px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.mm-node.collapsed+.mm-children {
    max-height: 0 !important;
    margin-top: 0;
}

.mm-sub-branch {
    margin-bottom: 10px;
}

.mm-leaf {
    background: rgba(255, 255, 255, 0.02);
    padding: 10px 14px;
    margin: 6px 0;
    border-radius: 8px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid transparent;
    transition: var(--transition-fast);
}

.mm-leaf:hover {
    background: rgba(230, 126, 34, 0.08);
    border-color: var(--border-color);
}

.mm-leaf i {
    color: var(--success-color);
    font-size: 0.4rem;
}

#exam-interface {
    padding-top: 75px;
    padding-bottom: 80px;
}

#progress-bar-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1001;
}

#progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--error-color), var(--warning-color), var(--success-color));
    transition: width 0.3s ease;
    border-radius: 0 3px 3px 0;
}

#progress-text {
    display: none;
    /* Moved to header score-box */
}

header {
    position: fixed;
    top: 5px;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 12px;
    z-index: 1000;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 900px;
    margin: 0 auto;
}

.back-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.back-btn:hover {
    background: var(--error-color);
    border-color: var(--error-color);
    color: white;
}

.theme-dropdown {
    position: relative;
}

#theme-toggle-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

#theme-toggle-btn:hover {
    color: var(--primary-color);
}

.theme-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 6px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: 0.3s ease;
    box-shadow: var(--shadow-lg);
    min-width: 130px;
    backdrop-filter: blur(15px);
    z-index: 200;
}

.theme-dropdown.active .theme-menu {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
}

@media (hover: hover) {
    .theme-dropdown:hover .theme-menu {
        opacity: 1;
        pointer-events: all;
        transform: translateY(0);
    }
}

.theme-menu button {
    background: transparent;
    border: none;
    color: var(--text-color);
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    text-align: right;
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'Cairo', sans-serif;
    font-weight: 600;
    width: 100%;
    transition: var(--transition-fast);
    font-size: 0.85rem;
}

.theme-menu button:hover {
    background: rgba(230, 126, 34, 0.2);
}

.theme-menu button i {
    width: 16px;
    text-align: center;
    color: var(--primary-color);
}

header h1 {
    flex: 1;
    font-size: 1rem;
    font-weight: 700;
    text-align: center;
}

header h1 span {
    color: var(--primary-color);
}

#timer-container {
    background: var(--surface-color);
    padding: 8px 14px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.95rem;
    border: 1px solid var(--border-color);
    display: flex;
    gap: 6px;
    align-items: center;
    flex-shrink: 0;
}

#timer-container i {
    color: var(--primary-color);
    font-size: 0.9rem;
}

#timer {
    font-variant-numeric: tabular-nums;
}

#timer.warning {
    color: var(--warning-color);
}

#timer.danger {
    color: var(--error-color);
    animation: blink 0.5s infinite;
}

.score-box {
    background: var(--surface-color);
    padding: 8px 14px;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.95rem;
    border: 1px solid var(--border-color);
    display: flex;
    gap: 6px;
    align-items: center;
    flex-shrink: 0;
}

.score-box i {
    color: var(--success-color);
    font-size: 0.9rem;
}

.score-box .score-value {
    color: var(--success-color);
    font-variant-numeric: tabular-nums;
}

#question-navigator {
    position: fixed;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 60px;
    max-height: 65vh;
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 12px 8px;
    z-index: 100;
    overflow-y: auto;
    display: none;

}

.nav-header {
    position: sticky;
    top: -12px;
    background: var(--surface-color);
    backdrop-filter: blur(10px);
    margin: -12px -8px 8px -8px;
    padding: 12px 8px 6px 8px;
    text-align: center;
    font-size: 0.6rem;
    color: var(--primary-color);
    font-weight: 700;
    border-bottom: 1px solid var(--border-color);
    z-index: 10;
}

.nav-header i {
    display: block;
    font-size: 1rem;
    margin-bottom: 2px;
}

#nav-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 4px;
}

.nav-btn {
    width: 100%;
    aspect-ratio: 1;
    border: none;
    background: var(--surface-color);
    color: var(--text-color);
    border-radius: 6px;
    font-size: 0.65rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: 'Cairo', sans-serif;
}

.nav-btn:hover {
    background: var(--primary-color);
}

.nav-btn.correct {
    background: var(--success-color);
    color: white;
}

.nav-btn.wrong {
    background: var(--error-color);
    color: white;
}

.nav-btn.answered {
    background: var(--info-color);
    color: white;
}

.nav-btn.current {
    box-shadow: 0 0 0 2px var(--primary-color);
}

#question-navigator::-webkit-scrollbar {
    width: 3px;
}

#question-navigator::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 2px;
}

.container {
    max-width: 700px;
    margin: 0 auto;
    padding: 15px;
}

.exam-instructions {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    padding: 18px;
    border-radius: var(--border-radius);
    margin-bottom: 18px;
    border: 1px solid var(--border-color);
    animation: slideUp 0.4s ease-out;
}

.exam-instructions h2 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.exam-instructions ul {
    list-style: none;
}

.exam-instructions li {
    padding: 5px 0;
    padding-right: 20px;
    position: relative;
    font-size: 0.9rem;
}

.exam-instructions li::before {
    content: '✓';
    position: absolute;
    right: 0;
    color: var(--success-color);
    font-weight: bold;
}

.question-card {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    padding: 18px;
    margin-bottom: 15px;
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    transition: var(--transition-smooth);
    animation: slideUp 0.4s ease-out;
    display: none;
}

.question-card.visible {
    display: block;
}

.question-card.correct {
    border-color: var(--success-color);
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.12), rgba(46, 204, 113, 0.05));
    animation: correctPulse 0.4s ease;
}

.question-card.wrong {
    border-color: var(--error-color);
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.12), rgba(231, 76, 60, 0.05));
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    font-weight: 700;
    font-size: 1rem;
}

.question-text {
    font-size: 1rem;
    margin-bottom: 15px;
    font-weight: 600;
    line-height: 1.7;
}

.options-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.option-label {
    display: flex;
    align-items: center;
    padding: 12px 14px;
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 600;
    font-size: 0.95rem;
}

.option-label:hover:not(.disabled) {
    background: rgba(230, 126, 34, 0.1);
    border-color: rgba(230, 126, 34, 0.4);
}

.option-label.disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

input[type="radio"] {
    margin-left: 12px;
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
    cursor: pointer;
    flex-shrink: 0;
}

input[type="radio"]:disabled {
    cursor: not-allowed;
}

.option-label.selected {
    border-color: var(--primary-color);
    background: rgba(230, 126, 34, 0.15);
}

.option-label.correct-answer {
    border-color: var(--success-color) !important;
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.2), rgba(46, 204, 113, 0.1)) !important;
    color: var(--success-color);
}

.option-label.correct-answer::before {
    content: '✓';
    margin-left: 8px;
    font-size: 1.1rem;
    font-weight: bold;
}

.option-label.wrong-answer {
    border-color: var(--error-color) !important;
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.2), rgba(231, 76, 60, 0.1)) !important;
}

.option-label.wrong-answer::before {
    content: '✗';
    margin-left: 8px;
    font-size: 1.1rem;
    color: var(--error-color);
    font-weight: bold;
}

.explanation {
    margin-top: 15px;
    padding: 15px;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.12), rgba(52, 152, 219, 0.05));
    border-right: 3px solid var(--info-color);
    border-radius: 10px;
    display: none;
    font-size: 0.9rem;
    line-height: 1.6;
    animation: slideUp 0.3s ease-out;
}

.explanation.correct-exp {
    background: linear-gradient(135deg, rgba(46, 204, 113, 0.12), rgba(46, 204, 113, 0.05));
    border-right-color: var(--success-color);
}

.explanation.wrong-exp {
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.12), rgba(231, 76, 60, 0.05));
    border-right-color: var(--error-color);
}

.explanation strong {
    display: block;
    margin-bottom: 6px;
}

.explanation .correct-text-answer {
    color: var(--success-color);
    font-weight: 700;
}

#pagination-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-top: 20px;
    padding: 15px;
    background: var(--glass-bg);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.pagination-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    padding: 10px 18px;
    border-radius: 10px;
    font-family: 'Cairo', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 6px;
}

.pagination-btn:hover:not(:disabled) {
    transform: translateY(-2px);
}

.pagination-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

#page-indicator {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary-color);
    background: var(--surface-color);
    padding: 8px 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    padding: 10px 15px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    z-index: 100;
}

.score-live {
    background: var(--surface-color);
    padding: 8px 14px;
    border-radius: 10px;
    font-size: 0.85rem;
    border: 1px solid var(--border-color);
}

.score-live strong {
    color: var(--success-color);
}

#submit-btn {
    background: linear-gradient(135deg, var(--primary-color), #d35400);
    color: white;
    border: none;
    padding: 10px 25px;
    font-size: 0.95rem;
    border-radius: 20px;
    cursor: pointer;
    font-family: 'Cairo', sans-serif;
    font-weight: 700;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

#submit-btn:hover {
    transform: translateY(-2px);
}

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
    justify-content: center;
    align-items: center;
    padding: 15px;
}

.modal-content {
    background: var(--surface-color);
    backdrop-filter: blur(20px);
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    width: 100%;
    max-width: 380px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    animation: scaleIn 0.4s ease;
}

.finish-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.modal-content h2 {
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.final-score-preview {
    margin: 15px 0;
}

.score-big {
    font-size: 3rem;
    font-weight: 800;
    color: var(--success-color);
    line-height: 1;
}

.score-big.failed {
    color: var(--error-color);
}

.modal-content p {
    font-size: 0.9rem;
}

.modal-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
    flex-wrap: wrap;
}

.btn-cancel,
.btn-confirm {
    padding: 10px 20px;
    border: none;
    border-radius: 10px;
    font-family: 'Cairo', sans-serif;
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-cancel {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-cancel:hover {
    background: rgba(255, 255, 255, 0.2);
}

.btn-confirm {
    background: linear-gradient(135deg, var(--success-color), #27ae60);
    color: white;
}

.btn-confirm:hover {
    transform: translateY(-2px);
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-gradient-1);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}

/* ============================================ */
/* MOBILE NAVIGATOR */
/* ============================================ */

/* Mobile Toggle Button (FAB) */
.mobile-nav-toggle {
    position: fixed;
    bottom: 90px;
    left: 15px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 999;
    box-shadow: 0 4px 12px rgba(230, 126, 34, 0.4);
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-nav-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 16px rgba(230, 126, 34, 0.5);
}

.mobile-nav-toggle:active {
    transform: scale(0.95);
}

/* Badge for answered count */
.mobile-nav-badge {
    display: none;
}

/* Mobile Navigator Panel - Default (Hidden) */
#question-navigator {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Mobile specific styles */
@media (max-width: 767px) {
    #question-navigator {
        display: block;
        left: 15px;
        top: 20vh;
        bottom: 145px;
        transform-origin: bottom center;
        transform: scale(0);
        opacity: 0;
        width: 80px;
        max-width: 80px;
        max-height: unset;
        height: auto;
        border-radius: 15px;
        border: 1px solid var(--border-color);
        padding: 12px 8px;
        z-index: 1600;
        overflow-x: hidden;
        transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s ease;
    }

    #question-navigator.active {
        transform: scale(1);
        opacity: 1;
    }

    .nav-header {
        font-size: 0.6rem;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        text-align: center;
    }

    .nav-header i {
        font-size: 1rem;
        margin-bottom: 2px;
        display: block;
    }

    .nav-header span {
        display: block;
    }

    .nav-close-btn {
        display: none;
    }

    #nav-buttons {
        gap: 4px;
    }

    .nav-btn {
        font-size: 0.65rem;
        min-height: 28px;
        aspect-ratio: 1;
    }
}

/* Hide mobile elements on desktop */
@media (min-width: 768px) {
    .mobile-nav-toggle {
        display: none;
    }

    .mobile-nav-overlay {
        display: none;
    }

    .nav-close-btn {
        display: none;
    }
}


@media (min-width: 768px) {
    .landing-header h1 {
        font-size: 2.2rem;
    }

    .mode-cards {
        gap: 20px;
    }

    .mode-card {
        padding: 30px 25px;
    }

    .card-icon {
        width: 70px;
        height: 70px;
        font-size: 1.8rem;
    }

    #exam-interface {
        padding-left: 85px;
    }

    #question-navigator {
        display: block;
    }

    header h1 {
        font-size: 1.2rem;
    }

    .container {
        max-width: 800px;
        padding: 20px;
    }

    .question-card {
        padding: 22px;
    }

    .question-text {
        font-size: 1.1rem;
    }

    .option-label {
        padding: 14px 18px;
    }

    .mm-root {
        font-size: 1.4rem;
        padding: 18px 30px;
    }

    .mm-node {
        font-size: 1rem;
        padding: 14px 18px;
    }

    .mm-children {
        padding-right: 30px;
    }
}

@media (max-width: 400px) {
    .landing-header h1 {
        font-size: 1.5rem;
    }

    .mode-card {
        padding: 20px 15px;
    }

    .card-icon {
        width: 50px;
        height: 50px;
        font-size: 1.3rem;
    }

    .mode-card h2 {
        font-size: 1.1rem;
    }

    .mode-card>p {
        font-size: 0.8rem;
        min-height: 35px;
    }

    .mindmap-tabs-header {
        width: 100%;
        justify-content: center;
        margin-top: 8px;
    }

    .tab-btn {
        padding: 6px 10px;
        font-size: 0.75rem;
    }

    header h1 {
        font-size: 0.9rem;
    }

    #timer-container {
        padding: 6px 10px;
        font-size: 0.85rem;
    }

    .question-text {
        font-size: 0.95rem;
    }

    .option-label {
        padding: 10px 12px;
        font-size: 0.9rem;
    }

    footer {
        gap: 10px;
        padding: 8px 12px;
    }

    .score-live {
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    #submit-btn {
        padding: 8px 18px;
        font-size: 0.85rem;
    }

    .modal-content {
        padding: 25px 20px;
    }

    .score-big {
        font-size: 2.5rem;
    }
}

.submenu {
    display: none;
    margin-top: 15px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    padding: 10px;
    animation: slideUp 0.3s ease-out;
}

.submenu-btn {
    width: 100%;
    padding: 12px;
    margin-bottom: 8px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: 'Cairo', sans-serif;
    font-weight: 700;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: white;
    transition: 0.2s;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.submenu-btn:last-child {
    margin-bottom: 0;
}

.btn-practice {
    background: linear-gradient(135deg, var(--info-color), #2980b9);
}

.btn-exam {
    background: linear-gradient(135deg, var(--primary-color), #d35400);
}

.submenu-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
    filter: brightness(1.1);
}

.section-header {
    margin: 40px 0 20px;
    padding: 15px;
    background: var(--surface-color);
    border-radius: 12px;
    border-right: 4px solid var(--primary-color);
    box-shadow: var(--shadow-md);
    animation: slideUp 0.4s ease-out;
}

.section-header h3 {
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
    color: var(--text-color);
}

.section-header i {
    color: var(--primary-color);
    font-size: 1.4rem;
}

@media (max-width: 480px) {
    .landing-header h1 {
        font-size: 1.4rem;
        line-height: 1.4;
    }

    .mode-card h2 {
        font-size: 1.1rem;
    }

    .submenu-btn {
        padding: 10px;
        font-size: 0.9rem;
    }
}@media (max-width: 1024px) {  .mindmap-page-header {    justify-content: space-between;    position: relative;  }  .mindmap-page-header .quick-nav {    width: 100%;    order: 10;    margin-top: 5px;    transition: max-height 0.4s ease, opacity 0.3s ease, margin 0.3s ease;    max-height: 200px;    overflow: hidden;    opacity: 1;  }  .mindmap-page-header .quick-nav.collapsed {    max-height: 0;    opacity: 0;    margin-top: 0;    pointer-events: none;  }  .quick-nav-toggle {    display: none;  }}@media (max-width: 768px) {  .quick-nav-toggle {    display: flex;    align-items: center;    justify-content: center;    width: 100%;    background: var(--surface-color);    border: none;    border-top: 1px solid var(--border-color);    border-bottom: 1px solid var(--border-color);    color: var(--text-muted);    padding: 4px 0;    cursor: pointer;    font-size: 0.9rem;    transition: all 0.3s ease;    order: 12;    margin-top: 4px;    display: none;  }  .quick-nav-toggle.visible {    display: flex;  }  .quick-nav-toggle:hover {    background: var(--bg-color);    color: var(--primary-color);  }  .quick-nav-toggle i {    transition: transform 0.3s ease;  }  .quick-nav-toggle.collapsed i {    transform: rotate(180deg);  }}

/* ===== Support Contact Text ===== */
.support-contact {
    text-align: center;
    margin-bottom: 12px;
    font-size: 0.9rem;
    color: var(--text-color);
    opacity: 0.9;
}

.support-contact a {
    color: #25d366;
    text-decoration: none;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: all 0.3s ease;
}

.support-contact a:hover {
    color: #128c7e;
    text-decoration: underline;
}