/* ===== CSS Variables & Reset ===== */
:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);
    --bg-card-hover: rgba(30, 41, 59, 0.8);
    --glass: rgba(255,255,255,0.05);
    --glass-border: rgba(255,255,255,0.08);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-1: #6366f1;
    --accent-2: #8b5cf6;
    --accent-3: #a78bfa;
    --gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
    --gradient-bg: linear-gradient(135deg, #0a0e1a 0%, #1e1b4b 50%, #0a0e1a 100%);
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;
    --radius: 16px;
    --radius-sm: 10px;
    --radius-lg: 24px;
    --shadow: 0 8px 32px rgba(0,0,0,0.3);
    --shadow-glow: 0 0 30px rgba(99,102,241,0.15);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

#particles-canvas {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0; pointer-events: none;
}

/* ===== Gradient Text ===== */
.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 14px 28px; border-radius: var(--radius-sm);
    font-weight: 600; font-size: 0.95rem;
    transition: var(--transition); position: relative; overflow: hidden;
}
.btn-primary {
    background: var(--gradient); color: #fff;
    box-shadow: 0 4px 15px rgba(99,102,241,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(99,102,241,0.4); }
.btn-outline {
    border: 2px solid var(--glass-border); color: var(--text-primary);
    background: var(--glass); backdrop-filter: blur(10px);
}
.btn-outline:hover { border-color: var(--accent-1); background: rgba(99,102,241,0.1); }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }
.btn-submit { background: linear-gradient(135deg, #22c55e, #16a34a); box-shadow: 0 4px 15px rgba(34,197,94,0.3); }

/* ===== Navbar ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 16px 0;
    background: rgba(10,14,26,0.8); backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}
.navbar.scrolled { padding: 10px 0; border-bottom-color: var(--glass-border); }
.nav-container { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.25rem; color: var(--text-primary); }
.nav-logo i { color: var(--accent-1); font-size: 1.4rem; }
.nav-links { display: flex; gap: 8px; }
.nav-link {
    padding: 8px 16px; border-radius: var(--radius-sm);
    font-weight: 500; font-size: 0.9rem; color: var(--text-secondary);
    transition: var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--text-primary); background: var(--glass); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: var(--transition); }

/* ===== Hero ===== */
.hero {
    min-height: 100vh; display: flex; align-items: center;
    padding: 120px 24px 80px;
    position: relative; z-index: 1;
    max-width: 1200px; margin: 0 auto;
    gap: 60px;
}
.hero-content { flex: 1; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 8px 18px; border-radius: 50px;
    background: rgba(99,102,241,0.1); border: 1px solid rgba(99,102,241,0.2);
    font-size: 0.85rem; color: var(--accent-3); margin-bottom: 24px;
}
.hero-title { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 900; line-height: 1.1; margin-bottom: 20px; }
.hero-subtitle { font-size: 1.1rem; color: var(--text-secondary); max-width: 520px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 48px; }
.hero-stats { display: flex; gap: 40px; }
.stat-item { text-align: center; }
.stat-number { font-size: 2.2rem; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat-label { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }

.hero-visual { flex: 0 0 380px; position: relative; height: 380px; }
.floating-card {
    position: absolute; display: flex; align-items: center; gap: 10px;
    padding: 14px 22px; border-radius: var(--radius-sm);
    background: var(--bg-card); border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px); box-shadow: var(--shadow);
    font-weight: 600; font-size: 0.9rem;
    animation: float 6s ease-in-out infinite;
}
.floating-card i { font-size: 1.3rem; color: var(--accent-1); }
.card-1 { top: 20px; left: 40px; animation-delay: 0s; }
.card-2 { top: 100px; right: 0; animation-delay: 1.5s; }
.card-3 { bottom: 100px; left: 10px; animation-delay: 3s; }
.card-4 { bottom: 20px; right: 30px; animation-delay: 4.5s; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* ===== Sections ===== */
.section { padding: 100px 0; position: relative; z-index: 1; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 16px; border-radius: 50px;
    background: rgba(99,102,241,0.1); border: 1px solid rgba(99,102,241,0.2);
    font-size: 0.85rem; color: var(--accent-3); margin-bottom: 16px;
}
.section-title { font-size: clamp(1.8rem, 3.5vw, 2.8rem); font-weight: 800; margin-bottom: 12px; }
.section-subtitle { color: var(--text-secondary); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

/* ===== About Cards ===== */
.about-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.about-card {
    padding: 40px; border-radius: var(--radius-lg);
    background: var(--bg-card); border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px); transition: var(--transition);
}
.about-card:hover { transform: translateY(-5px); border-color: rgba(99,102,241,0.3); box-shadow: var(--shadow-glow); }
.about-card-icon {
    width: 60px; height: 60px; border-radius: var(--radius-sm);
    background: rgba(99,102,241,0.15); display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; color: var(--accent-1); margin-bottom: 20px;
}
.about-card-icon.icon-accent { background: rgba(139,92,246,0.15); color: var(--accent-2); }
.about-card h3 { font-size: 1.4rem; margin-bottom: 12px; }
.about-card > p { color: var(--text-secondary); margin-bottom: 20px; }
.about-list { display: flex; flex-direction: column; gap: 10px; }
.about-list li { display: flex; align-items: center; gap: 10px; color: var(--text-secondary); font-size: 0.95rem; }
.about-list li i { color: var(--success); font-size: 0.85rem; }

/* ===== PDCA ===== */
.pdca-section {
    padding: 40px; border-radius: var(--radius-lg);
    background: var(--bg-card); border: 1px solid var(--glass-border);
    margin-bottom: 50px;
}
.pdca-header { text-align: center; margin-bottom: 30px; }
.pdca-header h3 { font-size: 1.4rem; margin-bottom: 8px; }
.pdca-header h3 i { color: var(--accent-1); margin-right: 8px; }
.pdca-header p { color: var(--text-secondary); }
.pdca-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.pdca-card {
    padding: 30px 20px; border-radius: var(--radius); text-align: center;
    border: 1px solid var(--glass-border); transition: var(--transition);
}
.pdca-card:hover { transform: translateY(-4px); }
.pdca-letter { font-size: 2.5rem; font-weight: 900; margin-bottom: 8px; }
.pdca-card h4 { font-size: 1.1rem; margin-bottom: 8px; }
.pdca-card p { font-size: 0.85rem; color: var(--text-secondary); }
.pdca-card.plan { background: rgba(59,130,246,0.08); border-color: rgba(59,130,246,0.2); }
.pdca-card.plan .pdca-letter { color: #3b82f6; }
.pdca-card.do { background: rgba(34,197,94,0.08); border-color: rgba(34,197,94,0.2); }
.pdca-card.do .pdca-letter { color: #22c55e; }
.pdca-card.check { background: rgba(245,158,11,0.08); border-color: rgba(245,158,11,0.2); }
.pdca-card.check .pdca-letter { color: #f59e0b; }
.pdca-card.act { background: rgba(239,68,68,0.08); border-color: rgba(239,68,68,0.2); }
.pdca-card.act .pdca-letter { color: #ef4444; }

/* ===== 7 QC Tools Grid ===== */
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 24px; }
.tool-card {
    padding: 32px; border-radius: var(--radius-lg);
    background: var(--bg-card); border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px); transition: var(--transition); position: relative; overflow: hidden;
}
.tool-card:hover { border-color: rgba(99,102,241,0.3); box-shadow: var(--shadow-glow); }
.tool-number { position: absolute; top: 16px; right: 20px; font-size: 3rem; font-weight: 900; color: rgba(99,102,241,0.08); }
.tool-icon {
    width: 56px; height: 56px; border-radius: var(--radius-sm);
    background: rgba(99,102,241,0.12); display: flex; align-items: center; justify-content: center;
    font-size: 1.4rem; color: var(--accent-1); margin-bottom: 16px;
}
.tool-card h3 { font-size: 1.2rem; margin-bottom: 8px; }
.tool-desc { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 16px; }
.tool-details {
    max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
}
.tool-card.expanded .tool-details { max-height: 500px; }
.tool-details h4 { font-size: 0.9rem; color: var(--accent-3); margin: 12px 0 8px; text-transform: uppercase; letter-spacing: 0.5px; }
.tool-details ul { padding-left: 0; }
.tool-details li { padding: 4px 0; color: var(--text-secondary); font-size: 0.9rem; position: relative; padding-left: 18px; }
.tool-details li::before { content: '▸'; position: absolute; left: 0; color: var(--accent-1); }
.tool-details > p { color: var(--text-secondary); font-size: 0.9rem; font-style: italic; }
.tool-toggle {
    display: flex; align-items: center; gap: 6px;
    color: var(--accent-1); font-size: 0.85rem; font-weight: 600;
    margin-top: 12px; transition: var(--transition);
}
.tool-toggle i { transition: transform 0.3s ease; }
.tool-card.expanded .tool-toggle i { transform: rotate(180deg); }
.tool-card.expanded .tool-toggle span::after { content: ''; }

/* ===== QCC Roles ===== */
.roles-section {
    padding: 40px; border-radius: var(--radius-lg);
    background: var(--bg-card); border: 1px solid var(--glass-border); margin-bottom: 50px;
}
.roles-section > h3 { font-size: 1.3rem; margin-bottom: 24px; text-align: center; }
.roles-section > h3 i { color: var(--accent-1); margin-right: 8px; }
.roles-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.role-card {
    padding: 24px; border-radius: var(--radius); text-align: center;
    background: rgba(255,255,255,0.02); border: 1px solid var(--glass-border);
    transition: var(--transition);
}
.role-card:hover { border-color: rgba(99,102,241,0.3); transform: translateY(-3px); }
.role-icon {
    width: 50px; height: 50px; border-radius: 50%; margin: 0 auto 14px;
    background: rgba(99,102,241,0.12); display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; color: var(--accent-1);
}
.role-card h4 { font-size: 1rem; margin-bottom: 8px; }
.role-card p { font-size: 0.85rem; color: var(--text-secondary); }
.role-card { cursor: pointer; }
.role-card .card-click-hint {
    display: flex; align-items: center; justify-content: center; gap: 4px; margin-top: 10px;
    color: var(--accent-1); font-size: 0.75rem; font-weight: 600;
}
.step-item { cursor: pointer; }
.step-item .card-click-hint {
    display: flex; align-items: center; gap: 4px; margin-top: 10px;
    color: var(--accent-1); font-size: 0.8rem; font-weight: 600;
}
/* Detail images & video */
.detail-img {
    width: 100%; border-radius: var(--radius); margin: 16px 0;
    border: 1px solid var(--glass-border);
}
.detail-video-container {
    position: relative; width: 100%; padding-bottom: 56.25%;
    border-radius: var(--radius); overflow: hidden; margin: 16px 0;
    border: 1px solid var(--glass-border);
}
.detail-video-container iframe {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none;
}

/* ===== 8 Steps Timeline ===== */
.steps-timeline { position: relative; padding-left: 40px; }
.steps-timeline::before {
    content: ''; position: absolute; left: 19px; top: 0; bottom: 0;
    width: 2px; background: linear-gradient(to bottom, var(--accent-1), var(--accent-2), var(--accent-3), transparent);
}
.step-item { position: relative; margin-bottom: 30px; }
.step-marker {
    position: absolute; left: -40px; top: 0;
    width: 40px; height: 40px; border-radius: 50%;
    background: var(--gradient); display: flex; align-items: center; justify-content: center;
    box-shadow: 0 0 20px rgba(99,102,241,0.3);
}
.step-number { font-weight: 800; font-size: 0.95rem; color: #fff; }
.step-content {
    padding: 28px 32px; border-radius: var(--radius);
    background: var(--bg-card); border: 1px solid var(--glass-border);
    transition: var(--transition);
}
.step-content:hover { border-color: rgba(99,102,241,0.3); box-shadow: var(--shadow-glow); }
.step-phase {
    display: inline-block; font-size: 0.75rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 1px;
    padding: 3px 12px; border-radius: 50px; margin-bottom: 10px;
    background: rgba(99,102,241,0.15); color: var(--accent-3);
}
.step-content h3 { font-size: 1.2rem; margin-bottom: 8px; }
.step-content > p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 12px; }
.step-tips {
    padding: 12px 16px; border-radius: var(--radius-sm);
    background: rgba(245,158,11,0.08); border: 1px solid rgba(245,158,11,0.15);
    font-size: 0.85rem; color: var(--text-secondary);
}
.step-tips i { color: var(--warning); }

/* ===== Subsection Headers ===== */
.subsection-header {
    margin: 50px 0 30px; text-align: center;
}
.subsection-header h3 {
    font-size: 1.5rem; font-weight: 700; color: var(--text-primary);
}
.subsection-header h3 i { color: var(--accent-1); margin-right: 10px; }

/* ===== Extra QC Grid ===== */
.extra-qc-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 24px; }
.extra-qc-card {
    padding: 32px; border-radius: var(--radius-lg);
    background: var(--bg-card); border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px); transition: var(--transition); position: relative; overflow: hidden;
}
.extra-qc-card:hover { border-color: rgba(99,102,241,0.3); box-shadow: var(--shadow-glow); }
.extra-qc-card .tool-icon { margin-bottom: 16px; }
.extra-qc-card h3 { font-size: 1.2rem; margin-bottom: 8px; }
.extra-qc-card .tool-desc { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 12px; }
.extra-qc-card .tool-details { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.extra-qc-card.expanded .tool-details { max-height: 600px; }
.extra-qc-card .tool-toggle { display: flex; align-items: center; gap: 6px; color: var(--accent-1); font-size: 0.85rem; font-weight: 600; margin-top: 12px; transition: var(--transition); }
.extra-qc-card .tool-toggle i { transition: transform 0.3s ease; }
.extra-qc-card.expanded .tool-toggle i { transform: rotate(180deg); }
.extra-qc-tag {
    position: absolute; top: 16px; right: 16px;
    padding: 4px 12px; border-radius: 50px; font-size: 0.7rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 0.5px;
    background: rgba(139,92,246,0.15); color: var(--accent-3); border: 1px solid rgba(139,92,246,0.25);
}

/* ===== Quiz Selector ===== */
.quiz-selector {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px;
    max-width: 960px; margin: 0 auto;
}

/* Section Labels spanning full grid */
.quiz-section-label {
    grid-column: 1 / -1;
    font-size: 1.15rem; font-weight: 700; color: var(--accent-3);
    padding: 12px 0 4px;
    display: flex; align-items: center; gap: 10px;
    border-bottom: 1px solid rgba(99,102,241,0.15);
    margin-bottom: 2px;
}
.quiz-section-label i { color: var(--accent-1); font-size: 1rem; }

/* Featured Card (Comprehensive) */
.quiz-card-featured {
    grid-column: 1 / -1;
    background: linear-gradient(135deg, rgba(99,102,241,0.08), rgba(139,92,246,0.08)) !important;
    border-color: rgba(99,102,241,0.35) !important;
}
.quiz-card-featured:hover {
    border-color: var(--accent-1) !important;
    box-shadow: 0 0 40px rgba(99,102,241,0.2) !important;
}
.quiz-card-ribbon {
    position: absolute; top: 14px; right: 14px;
    padding: 4px 14px; border-radius: 50px;
    font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px;
    background: var(--gradient); color: #fff;
}

.quiz-select-card {
    padding: 30px 22px; border-radius: var(--radius-lg); text-align: center;
    background: var(--bg-card); border: 2px solid var(--glass-border);
    backdrop-filter: blur(10px); cursor: pointer; transition: var(--transition);
    position: relative; overflow: hidden;
}
.quiz-select-card:hover { border-color: var(--accent-1); transform: translateY(-5px); box-shadow: var(--shadow-glow); }
.quiz-select-icon { font-size: 2.2rem; color: var(--accent-1); margin-bottom: 12px; }
.quiz-select-card h3 { font-size: 1.2rem; margin-bottom: 8px; }
.quiz-select-card p { color: var(--text-secondary); font-size: 0.82rem; margin-bottom: 14px; line-height: 1.5; }
.quiz-select-badge {
    display: inline-block; padding: 5px 14px; border-radius: 50px;
    background: rgba(99,102,241,0.12); color: var(--accent-3);
    font-size: 0.75rem; font-weight: 600;
}

/* ===== Quiz Identity Form ===== */
.quiz-identity { text-align: center; }
.quiz-identity h3 { font-size: 1.5rem; margin-bottom: 8px; }
.quiz-identity > p { color: var(--text-secondary); margin-bottom: 28px; }
.identity-form { max-width: 400px; margin: 0 auto; }
.form-group { margin-bottom: 20px; text-align: left; }
.form-group label {
    display: block; margin-bottom: 8px; font-weight: 600; font-size: 0.9rem; color: var(--text-secondary);
}
.form-group label i { margin-right: 6px; color: var(--accent-1); }
.form-group input {
    width: 100%; padding: 14px 18px; border-radius: var(--radius-sm);
    border: 2px solid var(--glass-border); background: rgba(255,255,255,0.03);
    color: var(--text-primary); font-family: var(--font); font-size: 0.95rem;
    transition: var(--transition); outline: none;
}
.form-group input::placeholder { color: var(--text-muted); }
.form-group input:focus { border-color: var(--accent-1); background: rgba(99,102,241,0.05); }
.form-error {
    display: flex; align-items: center; gap: 8px; justify-content: center;
    padding: 10px; margin-bottom: 16px; border-radius: var(--radius-sm);
    background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.2);
    color: var(--error); font-size: 0.85rem;
}
.identity-form .btn { width: 100%; justify-content: center; margin-top: 8px; }

/* ===== Quiz User Info Bar ===== */
.quiz-user-info {
    display: flex; align-items: center; gap: 12px;
    padding: 12px 18px; margin-bottom: 20px; border-radius: var(--radius-sm);
    background: rgba(99,102,241,0.08); border: 1px solid rgba(99,102,241,0.15);
    font-size: 0.85rem; color: var(--text-secondary);
}
.quiz-user-info i { color: var(--accent-1); }
.quiz-user-info strong { color: var(--text-primary); }

/* ===== Result User Card ===== */
.result-user-card {
    padding: 18px 24px; margin-bottom: 24px; border-radius: var(--radius);
    background: rgba(99,102,241,0.08); border: 1px solid rgba(99,102,241,0.15);
}
.result-user-card .user-name { font-size: 1.2rem; font-weight: 700; margin-bottom: 2px; }
.result-user-card .user-npk { font-size: 0.9rem; color: var(--text-secondary); }
.result-user-card .user-quiz-type { display: inline-block; margin-top: 6px; padding: 3px 12px; border-radius: 50px; background: rgba(139,92,246,0.15); color: var(--accent-3); font-size: 0.75rem; font-weight: 600; }

.result-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Quiz ===== */
.quiz-container {
    max-width: 720px; margin: 0 auto; padding: 48px;
    border-radius: var(--radius-lg);
    background: var(--bg-card); border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}
.quiz-intro { text-align: center; }
.quiz-intro-icon { font-size: 3.5rem; color: var(--accent-1); margin-bottom: 20px; }
.quiz-intro h3 { font-size: 1.6rem; margin-bottom: 12px; }
.quiz-intro > p { color: var(--text-secondary); margin-bottom: 30px; }
.quiz-info-cards { display: flex; justify-content: center; gap: 20px; margin-bottom: 36px; flex-wrap: wrap; }
.quiz-info-card {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 18px; border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.03); border: 1px solid var(--glass-border);
    font-size: 0.9rem; color: var(--text-secondary);
}
.quiz-info-card i { color: var(--accent-1); }

/* Quiz Header Row (progress + timer) */
.quiz-header-row {
    display: flex; align-items: flex-start; gap: 20px; margin-bottom: 30px;
}
.quiz-header-row .quiz-progress { flex: 1; margin-bottom: 0; }

.quiz-progress { margin-bottom: 30px; }
.quiz-progress-bar { height: 6px; background: rgba(255,255,255,0.05); border-radius: 3px; overflow: hidden; margin-bottom: 8px; }
.quiz-progress-fill { height: 100%; background: var(--gradient); border-radius: 3px; transition: width 0.4s ease; width: 10%; }
.quiz-progress-text { font-size: 0.85rem; color: var(--text-muted); }

/* Quiz Timer */
.quiz-timer {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 18px; border-radius: var(--radius-sm);
    background: rgba(99,102,241,0.08); border: 1px solid rgba(99,102,241,0.2);
    flex-shrink: 0; white-space: nowrap;
}
.quiz-timer i { color: var(--accent-1); font-size: 1rem; }
.quiz-timer-display {
    font-size: 1.3rem; font-weight: 800; color: var(--text-primary);
    font-variant-numeric: tabular-nums; letter-spacing: 1px;
    min-width: 60px; text-align: center;
    transition: color 0.3s ease;
}
.quiz-timer-display.timer-warning {
    color: var(--warning);
    animation: timerPulse 1s ease-in-out infinite;
}
.quiz-timer-display.timer-danger {
    color: var(--error);
    animation: timerPulse 0.5s ease-in-out infinite;
}
@keyframes timerPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.05); }
}

/* Quiz Time Badge on selector cards */
.quiz-time-badge {
    margin-left: 6px;
    background: rgba(245,158,11,0.12) !important;
    color: var(--warning) !important;
    border: 1px solid rgba(245,158,11,0.2);
}
.quiz-time-badge i { margin-right: 4px; font-size: 0.75rem; }

.question-card { margin-bottom: 24px; }
.question-text { font-size: 1.1rem; font-weight: 600; margin-bottom: 20px; line-height: 1.6; }
.question-text .q-num { color: var(--accent-1); }
.options-list { display: flex; flex-direction: column; gap: 12px; }
.option-item {
    display: flex; align-items: center; gap: 14px;
    padding: 16px 20px; border-radius: var(--radius-sm);
    background: rgba(255,255,255,0.03); border: 2px solid var(--glass-border);
    cursor: pointer; transition: var(--transition); font-size: 0.95rem;
}
.option-item:hover { border-color: rgba(99,102,241,0.3); background: rgba(99,102,241,0.05); }
.option-item.selected { border-color: var(--accent-1); background: rgba(99,102,241,0.1); }
.option-item.correct { border-color: var(--success); background: rgba(34,197,94,0.1); }
.option-item.wrong { border-color: var(--error); background: rgba(239,68,68,0.1); }
.option-letter {
    width: 32px; height: 32px; border-radius: 50%;
    background: rgba(255,255,255,0.05); display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 0.85rem; color: var(--text-muted); flex-shrink: 0;
    transition: var(--transition);
}
.option-item.selected .option-letter { background: var(--accent-1); color: #fff; }
.option-item.correct .option-letter { background: var(--success); color: #fff; }
.option-item.wrong .option-letter { background: var(--error); color: #fff; }

.quiz-nav { display: flex; justify-content: space-between; align-items: center; margin-top: 24px; }

/* Quiz Result */
.quiz-result { text-align: center; }
.result-circle { width: 160px; height: 160px; margin: 0 auto 24px; position: relative; }
.result-circle svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.result-bg { fill: none; stroke: rgba(255,255,255,0.05); stroke-width: 8; }
.result-fill {
    fill: none; stroke: url(#gradient) ; stroke-width: 8;
    stroke-linecap: round; stroke-dasharray: 339.292; stroke-dashoffset: 339.292;
    transition: stroke-dashoffset 1.5s ease;
}
.result-score {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    font-size: 1.8rem; font-weight: 800;
}
.quiz-result h3 { font-size: 1.5rem; margin-bottom: 8px; }
.quiz-result > p { color: var(--text-secondary); margin-bottom: 24px; }

.result-details { text-align: left; margin-bottom: 30px; max-height: 400px; overflow-y: auto; }
.result-item {
    padding: 16px; margin-bottom: 12px; border-radius: var(--radius-sm);
    border: 1px solid var(--glass-border);
}
.result-item.is-correct { border-left: 4px solid var(--success); background: rgba(34,197,94,0.05); }
.result-item.is-wrong { border-left: 4px solid var(--error); background: rgba(239,68,68,0.05); }
.result-item-q { font-weight: 600; margin-bottom: 6px; font-size: 0.9rem; }
.result-item-a { font-size: 0.85rem; color: var(--text-secondary); }
.result-item-a span { font-weight: 600; }
.result-item-a .correct-ans { color: var(--success); }
.result-item-a .wrong-ans { color: var(--error); }

/* ===== Footer ===== */
.footer {
    padding: 60px 0 0; position: relative; z-index: 1;
    background: rgba(0,0,0,0.3); border-top: 1px solid var(--glass-border);
}
.footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.2rem; margin-bottom: 14px; }
.footer-logo i { color: var(--accent-1); }
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; }
.footer-links-group h4 { font-size: 1rem; margin-bottom: 16px; color: var(--text-primary); }
.footer-links-group li { margin-bottom: 10px; }
.footer-links-group a { color: var(--text-muted); font-size: 0.9rem; transition: var(--transition); }
.footer-links-group a:hover { color: var(--accent-1); }
.footer-bottom { padding: 20px 0; border-top: 1px solid var(--glass-border); text-align: center; }
.footer-bottom p { color: var(--text-muted); font-size: 0.85rem; }

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed; bottom: 30px; right: 30px; z-index: 999;
    width: 48px; height: 48px; border-radius: 50%;
    background: var(--gradient); color: #fff; font-size: 1.1rem;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 15px rgba(99,102,241,0.4);
    opacity: 0; visibility: hidden; transform: translateY(20px);
    transition: var(--transition);
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-3px); }

/* ===== Reveal Animation ===== */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.active { opacity: 1; transform: translateY(0); }

/* ===== Card clickable style ===== */
.tool-card, .extra-qc-card { cursor: pointer; }
.tool-card:active, .extra-qc-card:active { transform: scale(0.98); }
.tool-card .card-click-hint, .extra-qc-card .card-click-hint {
    display: flex; align-items: center; gap: 6px; margin-top: 12px;
    color: var(--accent-1); font-size: 0.85rem; font-weight: 600;
}

/* ===== Detail Overlay ===== */
.detail-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 2000;
    background: var(--bg-primary);
    overflow-y: auto; opacity: 0; visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}
.detail-overlay.active { opacity: 1; visibility: visible; }
.detail-container { max-width: 900px; margin: 0 auto; padding: 24px 24px 80px; }
.detail-back {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 20px; margin-bottom: 30px;
    border-radius: var(--radius-sm); color: var(--text-primary);
    background: var(--glass); border: 1px solid var(--glass-border);
    font-weight: 600; font-size: 0.9rem; transition: var(--transition);
    position: sticky; top: 16px; z-index: 10; backdrop-filter: blur(20px);
}
.detail-back:hover { border-color: var(--accent-1); background: rgba(99,102,241,0.1); }
.detail-back i { color: var(--accent-1); }

/* Detail Content */
.detail-hero {
    padding: 40px; border-radius: var(--radius-lg);
    background: var(--bg-card); border: 1px solid var(--glass-border);
    margin-bottom: 30px;
}
.detail-hero-top { display: flex; align-items: center; gap: 20px; margin-bottom: 20px; }
.detail-hero-icon {
    width: 70px; height: 70px; border-radius: var(--radius);
    background: rgba(99,102,241,0.12); display: flex; align-items: center; justify-content: center;
    font-size: 1.8rem; color: var(--accent-1); flex-shrink: 0;
}
.detail-hero h1 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; }
.detail-hero-tag {
    display: inline-block; padding: 4px 14px; border-radius: 50px; margin-top: 6px;
    font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px;
    background: rgba(139,92,246,0.15); color: var(--accent-3); border: 1px solid rgba(139,92,246,0.25);
}
.detail-hero > p { color: var(--text-secondary); font-size: 1.05rem; line-height: 1.8; }

/* Detail Sections */
.detail-section {
    padding: 32px; border-radius: var(--radius-lg);
    background: var(--bg-card); border: 1px solid var(--glass-border);
    margin-bottom: 24px;
}
.detail-section h2 {
    font-size: 1.3rem; font-weight: 700; margin-bottom: 18px;
    display: flex; align-items: center; gap: 10px;
}
.detail-section h2 i { color: var(--accent-1); }
.detail-section h3 { font-size: 1.1rem; font-weight: 600; margin: 18px 0 10px; color: var(--accent-3); }
.detail-section p { color: var(--text-secondary); line-height: 1.8; margin-bottom: 12px; }
.detail-section ul { padding-left: 0; margin-bottom: 16px; }
.detail-section li {
    padding: 8px 0; color: var(--text-secondary); font-size: 0.95rem;
    position: relative; padding-left: 22px; line-height: 1.6;
}
.detail-section li::before { content: '▸'; position: absolute; left: 0; color: var(--accent-1); font-weight: bold; }
.detail-section .highlight-box {
    padding: 18px 22px; border-radius: var(--radius-sm); margin: 16px 0;
    background: rgba(99,102,241,0.06); border: 1px solid rgba(99,102,241,0.12);
}
.detail-section .highlight-box strong { color: var(--text-primary); }
.detail-section .warning-box {
    padding: 18px 22px; border-radius: var(--radius-sm); margin: 16px 0;
    background: rgba(245,158,11,0.06); border: 1px solid rgba(245,158,11,0.15);
}
.detail-section .warning-box i { color: var(--warning); margin-right: 8px; }

/* Diagram Examples */
.diagram-container {
    padding: 24px; border-radius: var(--radius); margin: 20px 0;
    background: rgba(0,0,0,0.3); border: 1px solid var(--glass-border);
    overflow-x: auto;
}
.diagram-title {
    font-size: 0.85rem; font-weight: 600; color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 16px;
    text-align: center;
}

/* Check Sheet Table */
.check-sheet-table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.check-sheet-table th, .check-sheet-table td {
    padding: 10px 14px; border: 1px solid var(--glass-border); text-align: center;
}
.check-sheet-table th { background: rgba(99,102,241,0.12); color: var(--accent-3); font-weight: 600; }
.check-sheet-table td { color: var(--text-secondary); }
.check-sheet-table tr:nth-child(even) td { background: rgba(255,255,255,0.02); }

/* Bar Chart (Histogram/Pareto) */
.bar-chart { display: flex; align-items: flex-end; gap: 8px; height: 200px; padding: 0 10px; justify-content: center; }
.bar-item { display: flex; flex-direction: column; align-items: center; gap: 6px; }
.bar-fill {
    width: 40px; border-radius: 6px 6px 0 0; min-height: 8px;
    transition: height 0.6s ease;
}
.bar-label { font-size: 0.7rem; color: var(--text-muted); text-align: center; max-width: 60px; }
.bar-value { font-size: 0.75rem; color: var(--text-secondary); font-weight: 600; }
.pareto-line { position: relative; }

/* Fishbone Diagram */
.fishbone-svg { width: 100%; max-width: 700px; margin: 0 auto; display: block; }

/* Scatter Plot */
.scatter-plot { position: relative; width: 100%; max-width: 400px; height: 250px; margin: 0 auto; border-left: 2px solid var(--text-muted); border-bottom: 2px solid var(--text-muted); }
.scatter-dot { position: absolute; width: 8px; height: 8px; border-radius: 50%; background: var(--accent-1); }
.scatter-label-x, .scatter-label-y { position: absolute; font-size: 0.75rem; color: var(--text-muted); }
.scatter-label-x { bottom: -22px; left: 50%; transform: translateX(-50%); }
.scatter-label-y { top: 50%; left: -45px; transform: translateY(-50%) rotate(-90deg); white-space: nowrap; }

/* Control Chart */
.control-chart-svg { width: 100%; max-width: 600px; margin: 0 auto; display: block; }

/* Flowchart */
.flow-chart { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.flow-item {
    padding: 12px 24px; border-radius: var(--radius-sm); text-align: center;
    font-size: 0.85rem; font-weight: 500; min-width: 180px;
}
.flow-start { background: rgba(34,197,94,0.15); border: 1px solid rgba(34,197,94,0.3); color: #22c55e; border-radius: 50px; }
.flow-process { background: rgba(99,102,241,0.1); border: 1px solid rgba(99,102,241,0.25); color: var(--accent-3); }
.flow-decision { background: rgba(245,158,11,0.1); border: 1px solid rgba(245,158,11,0.25); color: #f59e0b; transform: rotate(0deg); border-radius: 4px; }
.flow-end { background: rgba(239,68,68,0.15); border: 1px solid rgba(239,68,68,0.3); color: #ef4444; border-radius: 50px; }
.flow-arrow { color: var(--text-muted); font-size: 1.2rem; }
.flow-branch { display: flex; gap: 30px; align-items: flex-start; }
.flow-branch-label { font-size: 0.75rem; color: var(--text-muted); font-weight: 600; }

/* Steps List */
.steps-list { counter-reset: step-counter; }
.steps-list li { counter-increment: step-counter; padding-left: 36px; }
.steps-list li::before {
    content: counter(step-counter); position: absolute; left: 0; top: 8px;
    width: 22px; height: 22px; border-radius: 50%;
    background: var(--gradient); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.7rem; font-weight: 700;
}

/* ===== Responsive ===== */
@media (max-width: 968px) {
    .hero { flex-direction: column; text-align: center; padding-top: 100px; }
    .hero-subtitle { margin-left: auto; margin-right: auto; }
    .hero-actions { justify-content: center; }
    .hero-stats { justify-content: center; }
    .hero-visual { display: none; }
    .about-grid { grid-template-columns: 1fr; }
    .pdca-grid { grid-template-columns: repeat(2, 1fr); }
    .roles-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: 1fr; text-align: center; }
    .quiz-selector { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .nav-links {
        position: fixed; top: 0; right: -100%; width: 280px; height: 100vh;
        flex-direction: column; padding: 80px 30px 30px;
        background: var(--bg-secondary); border-left: 1px solid var(--glass-border);
        transition: right 0.3s ease; gap: 4px;
    }
    .nav-links.open { right: 0; }
    .nav-toggle { display: flex; }
    .tools-grid { grid-template-columns: 1fr; }
    .extra-qc-grid { grid-template-columns: 1fr; }
    .quiz-selector { grid-template-columns: 1fr; }
    .quiz-card-featured { grid-column: 1 / -1; }
    .quiz-container { padding: 28px 20px; }
    .steps-timeline { padding-left: 30px; }
    .step-marker { left: -30px; width: 32px; height: 32px; }
    .step-number { font-size: 0.8rem; }
}
@media (max-width: 480px) {
    .pdca-grid { grid-template-columns: 1fr; }
    .roles-grid { grid-template-columns: 1fr; }
    .hero-stats { flex-direction: column; gap: 16px; }
}