/* ===== CSS Variables ===== */
:root {
    --dark-green: #1b4332;
    --mid-green: #2d6a4f;
    --light-green: #52b788;
    --pale-green: #d8f3dc;
    --sun-yellow: #f4a261;
    --bg: #f4faf6;
    --text: #1a1a2e;
    --text-muted: #5a6a60;
    --card-bg: #ffffff;
    --border: #b7e4c7;
    --success: #1b5e20;
    --success-bg: #d4edda;
    --error: #b71c1c;
    --error-bg: #fde8e8;
    --shadow: 0 2px 14px rgba(27,67,50,0.1);
    --radius: 12px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Assistant', 'Arial Hebrew', Arial, sans-serif;
    font-size: 17px;
    line-height: 1.75;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
    direction: rtl;
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
    font-family: 'Frank Ruhl Libre', 'David', Georgia, serif;
    color: var(--dark-green);
    line-height: 1.3;
    font-weight: 700;
}
h1 { font-size: 2.2rem; }
h2 { font-size: 1.7rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; }
p  { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

a { color: var(--mid-green); }

/* ===== Layout ===== */
.container { max-width: 960px; margin: 0 auto; padding: 0 20px; }
.page-wrap  { padding: 28px 0 70px; }

/* ===== Top Bar ===== */
.top-bar {
    background: var(--dark-green);
    color: white;
    padding: 11px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 200;
    box-shadow: 0 2px 8px rgba(0,0,0,0.25);
    gap: 12px;
}
.site-title {
    font-family: 'Frank Ruhl Libre', serif;
    font-size: 1.1rem;
    color: var(--sun-yellow);
    font-weight: 700;
    white-space: nowrap;
}
.student-info { font-size: 0.88rem; opacity: .85; flex: 1; text-align: center; }
.nav-home {
    color: var(--light-green);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 4px 14px;
    border: 1px solid var(--light-green);
    border-radius: 20px;
    transition: .2s;
    white-space: nowrap;
}
.nav-home:hover { background: var(--light-green); color: var(--dark-green); }

/* ===== Global Progress Bar ===== */
.global-progress-bar { background: #c3e6cb; height: 5px; }
.global-progress-fill {
    background: linear-gradient(90deg, var(--light-green), var(--sun-yellow));
    height: 100%;
    transition: width .7s ease;
}

/* ===== Hero ===== */
.hero {
    background: linear-gradient(135deg, var(--dark-green) 0%, var(--mid-green) 100%);
    padding: 48px 20px 40px;
    text-align: center;
    color: white;
}
.hero h1  { color: var(--sun-yellow); font-size: 2.4rem; margin-bottom: 10px; }
.hero p   { color: #b7e4c7; font-size: 1.05rem; max-width: 580px; margin: 0 auto; }

/* ===== Module-page hero (smaller) ===== */
.module-hero {
    background: linear-gradient(135deg, var(--dark-green), var(--mid-green));
    padding: 28px 20px 24px;
    color: white;
}
.module-hero h1 { color: var(--sun-yellow); font-size: 1.7rem; margin-bottom: 6px; }
.module-hero p  { color: #b7e4c7; font-size: 0.95rem; margin: 0; }

/* ===== Cards ===== */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 26px 28px;
    margin-bottom: 22px;
    border: 1px solid var(--border);
}
.card-title {
    font-size: 1.2rem;
    color: var(--dark-green);
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--light-green);
    display: flex;
    align-items: center;
    gap: 9px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 11px 26px;
    border-radius: 8px;
    border: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-family: inherit;
    font-weight: 600;
    transition: all .2s;
    text-decoration: none;
    min-height: 46px;
    line-height: 1;
}
.btn-primary   { background: var(--dark-green); color: white; }
.btn-primary:hover  { background: var(--mid-green); transform: translateY(-1px); }
.btn-secondary { background: var(--light-green); color: var(--dark-green); }
.btn-secondary:hover{ background: #40916c; color: white; transform: translateY(-1px); }
.btn-yellow    { background: var(--sun-yellow); color: var(--dark-green); }
.btn-yellow:hover   { background: #e07b3a; transform: translateY(-1px); }
.btn-outline   { background: transparent; border-color: var(--dark-green); color: var(--dark-green); }
.btn-outline:hover  { background: var(--dark-green); color: white; }
.btn-sm  { padding: 7px 16px; font-size: 0.88rem; min-height: 36px; }
.btn-lg  { padding: 14px 34px; font-size: 1.1rem; min-height: 54px; }
.btn-full{ width: 100%; }

/* ===== Forms ===== */
.form-group { margin-bottom: 18px; }
label { display: block; font-weight: 600; margin-bottom: 5px; color: var(--dark-green); }
input[type="text"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 11px 14px;
    border: 2px solid #c8e6c9;
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    direction: rtl;
    background: white;
    transition: border-color .2s, box-shadow .2s;
    color: var(--text);
}
input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--light-green);
    box-shadow: 0 0 0 3px rgba(82,183,136,.2);
}
textarea { resize: vertical; min-height: 95px; }
small { font-size: 0.83rem; color: var(--text-muted); }

/* ===== Login ===== */
.login-wrap { max-width: 480px; margin: 40px auto; }
.login-card {
    background: white;
    border-radius: var(--radius);
    padding: 38px;
    box-shadow: 0 6px 28px rgba(27,67,50,0.14);
    text-align: center;
}
.login-card h2 { margin-bottom: 6px; }
.login-card > p { color: #666; margin-bottom: 26px; }
.login-icon { font-size: 3rem; margin-bottom: 12px; }

/* ===== Modules Grid ===== */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
    margin-top: 24px;
}
.module-card {
    background: white;
    border-radius: var(--radius);
    padding: 22px;
    border: 2px solid var(--border);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    gap: 10px;
    transition: all .25s;
    position: relative;
    overflow: hidden;
}
.module-card::after {
    content: '';
    position: absolute;
    top: 0; right: 0;
    width: 5px; height: 100%;
    background: var(--light-green);
}
.module-card:hover { border-color: var(--light-green); transform: translateY(-3px); box-shadow: 0 8px 24px rgba(27,67,50,.14); }
.module-num { font-size: 0.8rem; color: var(--light-green); font-weight: 700; letter-spacing: 1px; }
.module-card h3 { font-size: 1.05rem; color: var(--dark-green); margin: 0; }
.module-card > p { font-size: 0.88rem; color: #555; margin: 0; }
.mod-progress { background: #e9ecef; border-radius: 20px; height: 7px; }
.mod-progress-fill { background: linear-gradient(90deg, var(--light-green), var(--sun-yellow)); height: 100%; border-radius: 20px; transition: width .5s; }
.mod-status { font-size: 0.83rem; color: #777; }

/* ===== Exercise ===== */
.exercise {
    background: #f0fdf4;
    border: 1px solid #b7e4c7;
    border-radius: 10px;
    padding: 22px;
    margin-bottom: 18px;
}
.ex-num { font-size: 0.8rem; font-weight: 700; color: var(--light-green); margin-bottom: 6px; letter-spacing: .5px; }
.exercise h4 { color: var(--dark-green); margin-bottom: 10px; }

/* ===== Multiple Choice ===== */
.mc-opts { display: flex; flex-direction: column; gap: 9px; margin-top: 10px; }
.mc-opt {
    display: flex; align-items: flex-start; gap: 11px;
    padding: 11px 15px;
    border: 2px solid #dde; border-radius: 8px;
    cursor: pointer; transition: .2s; background: white;
    font-size: 1rem;
}
.mc-opt:hover  { border-color: var(--light-green); background: #f0fdf4; }
.mc-opt.sel    { border-color: var(--dark-green); background: #d8f3dc; }
.mc-opt.right  { border-color: #2d6a4f; background: #d4edda; color: var(--success); font-weight: 600; }
.mc-opt.wrong  { border-color: var(--error); background: var(--error-bg); color: var(--error); }
.mc-opt input  { margin-top: 2px; width: auto; accent-color: var(--dark-green); }

/* ===== Feedback ===== */
.feedback {
    display: none;
    padding: 13px 16px;
    border-radius: 8px;
    margin-top: 10px;
    font-weight: 600;
    font-size: 1rem;
    align-items: flex-start;
    gap: 9px;
    line-height: 1.5;
}
.fb-ok  { background: var(--success-bg); border: 1px solid #b7e4c7; color: var(--success); }
.fb-err { background: var(--error-bg);   border: 1px solid #f5c6cb; color: var(--error); }
.fb-info{ background: #e8f4fd; border: 1px solid #bee5eb; color: #1a3a5c; }

/* ===== Model Answer Box ===== */
.model-ans {
    background: #fff8e1;
    border: 1px solid #ffe082;
    border-radius: 8px;
    padding: 14px;
    margin-top: 10px;
    display: none;
}
.model-ans.show { display: block; }
.model-ans strong { color: #5d4037; }
.model-ans p { color: #4a3728; margin: 4px 0 0; }

/* ===== Tables ===== */
.data-table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 0.95rem; }
.data-table th {
    background: var(--dark-green); color: white;
    padding: 11px 14px; text-align: center; font-weight: 600;
}
.data-table td { padding: 9px 14px; border: 1px solid var(--border); text-align: center; }
.data-table tr:nth-child(even) td { background: #f0fdf4; }
.data-table tr:hover td { background: #d8f3dc; }
.data-table td input { border: 1px solid #ccc; padding: 5px 8px; width: 100%; font-size: 0.9rem; }

/* ===== Checklist ===== */
.checklist { list-style: none; }
.checklist li {
    display: flex; align-items: center; gap: 11px;
    padding: 9px 0;
    border-bottom: 1px solid #e9ecef;
    font-size: 1rem;
}
.checklist li input { width: 20px; height: 20px; accent-color: var(--dark-green); flex-shrink: 0; }

/* ===== Graph Canvas ===== */
.graph-wrap { border: 2px solid var(--border); border-radius: 10px; overflow: hidden; background: white; }
.graph-toolbar {
    background: #f8f9fa;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    display: flex; gap: 8px; flex-wrap: wrap; align-items: center;
}
.graph-toolbar input[type="text"] { width: auto; flex: 1; min-width: 120px; padding: 6px 10px; font-size: 0.9rem; }
#graphCanvas { display: block; cursor: crosshair; max-width: 100%; }

/* ===== Video ===== */
.video-block { margin-bottom: 30px; }
.video-label { font-weight: 700; color: var(--dark-green); margin-bottom: 6px; font-size: 1.05rem; }
.video-frame { border-radius: 10px; overflow: hidden; box-shadow: var(--shadow); background: #000; }
video { width: 100%; display: block; max-height: 400px; }

/* ===== Timer ===== */
.timer {
    background: var(--dark-green);
    color: white;
    font-size: 2.4rem;
    font-weight: 700;
    text-align: center;
    padding: 14px;
    border-radius: 10px;
    font-variant-numeric: tabular-nums;
    letter-spacing: 3px;
    margin-bottom: 18px;
}
.timer.warn   { background: #e07b3a; }
.timer.danger { background: var(--error); animation: blink 1s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.6} }

/* ===== Score ===== */
.score-box {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, var(--dark-green), var(--mid-green));
    color: white;
    border-radius: var(--radius);
    margin: 20px 0;
}
.score-num  { font-size: 4rem; font-weight: 700; color: var(--sun-yellow); line-height: 1; }
.score-of   { font-size: 1.4rem; color: #b7e4c7; }
.score-pct  { font-size: 1.1rem; color: #d8f3dc; margin-top: 6px; }

/* ===== Definition Box ===== */
.def-box {
    background: linear-gradient(135deg, #e8f5e9, #f1f8e9);
    border: 2px solid var(--light-green);
    border-radius: 10px;
    padding: 18px 22px;
    margin-bottom: 14px;
}
.def-term { font-weight: 800; color: var(--dark-green); font-size: 1.05rem; margin-bottom: 4px; }
.def-body { color: #333; margin: 0; }

/* ===== Callout ===== */
.callout {
    padding: 14px 18px;
    border-radius: 8px;
    margin: 14px 0;
    border-right: 5px solid;
}
.tip  { background: #f0fdf4; border-color: var(--light-green); color: var(--dark-green); }
.warn { background: #fff8e1; border-color: var(--sun-yellow); color: #5d4037; }
.info { background: #e3f2fd; border-color: #1976d2; color: #0d47a1; }

/* ===== Step Indicator ===== */
.steps { display: flex; gap: 7px; justify-content: center; flex-wrap: wrap; margin: 16px 0; }
.step {
    width: 34px; height: 34px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.88rem;
    border: 2px solid #ccc;
    background: white; color: #aaa; transition: .3s;
}
.step.active { background: var(--dark-green); color: white; border-color: var(--dark-green); }
.step.done   { background: var(--light-green); color: white; border-color: var(--light-green); }

/* ===== Module footer nav ===== */
.module-nav {
    display: flex; gap: 12px;
    justify-content: space-between;
    margin-top: 28px; padding-top: 18px;
    border-top: 2px solid var(--border);
    flex-wrap: wrap;
}

/* ===== Performance table ===== */
.perf-good { background: #d4edda !important; color: var(--success); font-weight: 700; }
.perf-ok   { background: #fff3cd !important; color: #856404; font-weight: 700; }
.perf-weak { background: var(--error-bg) !important; color: var(--error); font-weight: 700; }

/* ===== Utilities ===== */
.hidden  { display: none !important; }
.text-c  { text-align: center; }
.mt-1    { margin-top: 8px; }
.mt-2    { margin-top: 16px; }
.mt-3    { margin-top: 26px; }
.mb-2    { margin-bottom: 16px; }
.gap     { gap: 12px; }
.flex    { display: flex; }
.wrap    { flex-wrap: wrap; }
.between { justify-content: space-between; }
.w100    { width: 100%; }
.bold    { font-weight: 700; }
.muted   { color: var(--text-muted); font-size: 0.9rem; }

/* ===== Badge ===== */
.badge { display: inline-block; padding: 2px 10px; border-radius: 20px; font-size: 0.78rem; font-weight: 700; }
.badge-g { background: #d4edda; color: var(--success); }
.badge-y { background: #fff3cd; color: #856404; }
.badge-r { background: var(--error-bg); color: var(--error); }

/* ===== Progress bar (inline) ===== */
.pbar { background: #e9ecef; border-radius: 20px; height: 10px; margin: 6px 0; }
.pbar-fill { background: linear-gradient(90deg, var(--light-green), var(--sun-yellow)); height: 100%; border-radius: 20px; transition: width .5s; }

/* ===== Exam question ===== */
.q-block {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 16px;
    background: white;
}
.q-block h4 { color: var(--dark-green); margin-bottom: 10px; }
.q-pts { font-size: 0.82rem; background: var(--pale-green); color: var(--dark-green); padding: 2px 9px; border-radius: 12px; font-weight: 700; display: inline-block; margin-bottom: 8px; }

/* ===== Responsive ===== */
@media (max-width: 640px) {
    h1 { font-size: 1.7rem; }
    .hero h1 { font-size: 1.9rem; }
    .modules-grid { grid-template-columns: 1fr; }
    .card { padding: 14px; }
    .timer { font-size: 1.9rem; }
    .btn { padding: 9px 18px; font-size: 1rem; }

    /* textarea גדול יותר בנייד — מונע zoom אוטומטי ב-iOS */
    textarea, input[type="text"], input[type="number"] {
        font-size: 16px !important;
        min-height: 48px;
    }
    textarea.answer-box, textarea.exam-area {
        min-height: 90px;
    }

    /* טבלאות נגללות בנייד */
    .data-table, table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        max-width: 100%;
    }

    /* כפתורי ניווט — מלאי רוחב בנייד */
    .module-nav { flex-direction: column; }
    .module-nav .btn { width: 100%; text-align: center; }

    /* canvas — לא חורג ממסך */
    canvas { max-width: 100% !important; height: auto !important; }
}

/* ===== btn.checked state ===== */
.btn.checked {
    background: #9e9e9e !important;
    cursor: default;
    opacity: 0.85;
}

/* ===== Google Fonts ===== */
@import url('https://fonts.googleapis.com/css2?family=Frank+Ruhl+Libre:wght@400;700;900&family=Assistant:wght@400;600;700&display=swap');