/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: #333;
    line-height: 1.6;
    background: #fff;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; }
input, button { font-family: inherit; }

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    border-bottom: 1px solid #eee;
    transition: box-shadow 0.3s;
}
.navbar.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.08); }
.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}
.logo {
    font-weight: 800;
    font-size: 1.25rem;
    color: #e67e22;
}
.nav-links {
    display: flex;
    gap: 1.5rem;
}
.nav-links a {
    font-size: 0.85rem;
    font-weight: 500;
    color: #555;
    transition: color 0.2s;
}
.nav-links a:hover { color: #e67e22; }
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}
.nav-toggle span {
    width: 24px;
    height: 2px;
    background: #333;
    border-radius: 2px;
    transition: 0.3s;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    overflow: hidden;
    margin-top: 60px;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="1" fill="rgba(255,255,255,0.05)"/><circle cx="80" cy="40" r="1.5" fill="rgba(255,255,255,0.03)"/><circle cx="50" cy="70" r="1" fill="rgba(255,255,255,0.04)"/></svg>');
}
.hero-content {
    position: relative;
    text-align: center;
    padding: 3rem 1.5rem;
}
.badge {
    display: inline-block;
    background: #e67e22;
    color: #fff;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.35rem 1rem;
    border-radius: 20px;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.hero h1 {
    color: #fff;
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1rem;
    letter-spacing: -1px;
}
.hero p {
    color: rgba(255,255,255,0.7);
    font-size: 1.05rem;
    max-width: 550px;
    margin: 0 auto;
}

/* ===== Sections ===== */
.section {
    padding: 4rem 0;
}
.section-gray { background: #f9f9f9; }
.section-dark { background: #1a1a2e; color: #fff; }

.section-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}
.section-header.light h2 { color: #fff; }
.section-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: #e67e22;
    color: #fff;
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
}
.section-header h2 {
    font-size: 1.6rem;
    font-weight: 700;
    color: #1a1a2e;
    letter-spacing: -0.5px;
}

/* ===== Content Cards ===== */
.content-card {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid #eee;
}
.content-card h3 { font-size: 1.15rem; margin-bottom: 0.75rem; }
.content-card h4 { font-size: 1rem; margin-bottom: 0.75rem; color: #1a1a2e; }
.content-card p { color: #555; font-size: 0.95rem; }
.content-card ul { padding-left: 1.25rem; list-style: disc; }
.content-card ul li { color: #555; font-size: 0.9rem; margin-bottom: 0.4rem; }

.accent-text { color: #e67e22; }
.text-red { color: #e74c3c; }
.text-green { color: #27ae60; }
.text-orange { color: #e67e22; }

.card-icon {
    width: 40px;
    height: 40px;
    background: #fff3e0;
    color: #e67e22;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

/* ===== Two Column ===== */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

/* ===== Feature Items ===== */
.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}
.feature-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}
.feature-icon.orange { background: #fff3e0; color: #e67e22; }
.feature-icon.green { background: #e8f5e9; color: #27ae60; }

/* ===== Quote ===== */
.quote {
    margin-top: 1.5rem;
    padding: 1rem 1.5rem;
    background: #fdf6ec;
    border-left: 3px solid #e67e22;
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: #555;
    font-size: 0.95rem;
}

/* ===== Stats Grid ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}
.stat-card {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    border: 1px solid #eee;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.stat-number {
    font-size: 1.75rem;
    font-weight: 800;
    color: #1a1a2e;
}
.stat-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: #555;
}
.stat-desc {
    font-size: 0.75rem;
    color: #999;
}

/* ===== Icon circles ===== */
.icon-circle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
    margin-right: 0.5rem;
}
.icon-circle.red { background: #e74c3c; }
.icon-circle.green { background: #27ae60; }

/* ===== Bar Compare ===== */
.bar-compare { display: flex; flex-direction: column; gap: 0.75rem; }
.bar-item { display: flex; align-items: center; gap: 1rem; }
.bar-label { width: 120px; font-size: 0.8rem; font-weight: 500; color: #555; flex-shrink: 0; }
.bar-track { flex: 1; height: 24px; background: #f0f0f0; border-radius: 12px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 12px; transition: width 1s ease; }
.bar-red { background: linear-gradient(90deg, #e74c3c, #c0392b); }
.bar-green { background: linear-gradient(90deg, #27ae60, #2ecc71); }

/* ===== Sub sections ===== */
.sub-section { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid #f0f0f0; }

/* ===== Highlight Box ===== */
.highlight-box {
    background: #fdf6ec;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 0.75rem;
}
.highlight-box p { font-size: 0.9rem; }

.highlight-card {
    background: linear-gradient(135deg, #1a1a2e, #0f3460);
    color: #fff;
    border: none;
}
.highlight-card h3 { color: #e67e22; font-size: 1.3rem; }
.highlight-card .strategy-point { color: rgba(255,255,255,0.85); }

/* ===== Flow Steps ===== */
.flow-steps {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.25rem;
    flex-wrap: wrap;
}
.flow-step {
    background: #fff3e0;
    color: #e67e22;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
}
.flow-arrow { color: #ccc; font-weight: 700; }

/* ===== Strategy Points ===== */
.strategy-points { display: flex; flex-direction: column; gap: 1rem; margin-top: 1rem; }
.strategy-point { font-size: 0.9rem; line-height: 1.5; }

/* ===== Audience Grid ===== */
.audience-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1rem;
}
.audience-card {
    background: #fff;
    border-radius: 12px;
    padding: 1.25rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    border: 1px solid #eee;
    transition: transform 0.2s, box-shadow 0.2s;
}
.audience-card:hover { transform: translateY(-3px); box-shadow: 0 8px 25px rgba(0,0,0,0.08); }
.audience-icon { font-size: 1.5rem; }
.audience-label { font-size: 0.7rem; font-weight: 700; letter-spacing: 1px; color: #999; }
.audience-number { font-size: 1.5rem; font-weight: 800; color: #1a1a2e; }
.audience-card.guest .audience-icon { color: #95a5a6; }
.audience-card.member .audience-icon { color: #e67e22; }
.audience-card.silver .audience-icon { color: #bdc3c7; }
.audience-card.gold .audience-icon { color: #f1c40f; }
.audience-card.diamond .audience-icon { color: #3498db; }

/* ===== Tier Badges ===== */
.tier-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    color: #fff;
}
.guest-bg { background: #95a5a6; }
.member-bg { background: #e67e22; }
.silver-bg { background: #95a5a6; }
.gold-bg { background: #f1c40f; color: #333 !important; }
.diamond-bg { background: #3498db; }

/* ===== Data Table ===== */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}
.data-table th {
    background: #f5f5f5;
    padding: 0.6rem 0.75rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.8rem;
    color: #555;
    border-bottom: 2px solid #eee;
}
.data-table td {
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid #f0f0f0;
    color: #555;
}
.dark-table { background: rgba(255,255,255,0.05); border-radius: 12px; overflow: hidden; }
.dark-table th { background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.7); border-color: rgba(255,255,255,0.1); }
.dark-table td { color: rgba(255,255,255,0.8); border-color: rgba(255,255,255,0.05); }
.total-row td { border-top: 2px solid #e67e22; }

.note { font-size: 0.8rem; color: #999; margin-top: 0.75rem; font-style: italic; }

/* ===== Benefit List ===== */
.benefit-list { display: flex; flex-direction: column; gap: 0.75rem; }
.benefit-item {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem;
    background: #fafafa;
    border-radius: 8px;
}
.benefit-item .tier-badge { flex-shrink: 0; margin-top: 0.1rem; }
.benefit-item p { font-size: 0.85rem; color: #555; margin: 0; }
.benefit-item em { font-size: 0.8rem; }

/* ===== RFM Grid ===== */
.rfm-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
    margin-top: 1rem;
}
.rfm-cell {
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.rfm-name { font-size: 0.75rem; font-weight: 600; }
.rfm-count { font-size: 1.1rem; font-weight: 800; }
.rfm-champions { background: #e8f5e9; color: #27ae60; }
.rfm-loyal { background: #e3f2fd; color: #1976d2; }
.rfm-potential { background: #fff3e0; color: #e67e22; }
.rfm-new { background: #f3e5f5; color: #8e24aa; }
.rfm-promising { background: #e0f7fa; color: #00838f; }
.rfm-attention { background: #fff8e1; color: #f57f17; }
.rfm-about { background: #fce4ec; color: #c62828; }
.rfm-risk { background: #ffebee; color: #b71c1c; }
.rfm-cant { background: #fbe9e7; color: #d84315; }
.rfm-hibernating { background: #f5f5f5; color: #616161; }
.rfm-lost { background: #eceff1; color: #455a64; }

/* ===== Revenue Section ===== */
.revenue-target {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 2rem;
}
.revenue-label { color: rgba(255,255,255,0.6); font-size: 0.85rem; }
.revenue-amount {
    font-size: 2.5rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: -1px;
}
.table-wrapper { overflow-x: auto; }

/* ===== Tools Section ===== */
.tool-card {
    background: #fff;
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid #eee;
}
.tool-title { font-size: 1.15rem; color: #1a1a2e; margin-bottom: 0.25rem; }
.tool-desc { color: #777; font-size: 0.9rem; margin-bottom: 1.5rem; }
.tool-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}
.input-group {
    margin-bottom: 1rem;
}
.input-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: #555;
    margin-bottom: 0.3rem;
}
.input-group input {
    width: 100%;
    padding: 0.6rem 0.75rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 0.9rem;
    transition: border-color 0.2s;
    outline: none;
}
.input-group input:focus { border-color: #e67e22; }

.btn-primary {
    width: 100%;
    padding: 0.7rem;
    background: #1a1a2e;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}
.btn-primary:hover { background: #2d2d4e; }

.tool-results { display: flex; flex-direction: column; gap: 0.75rem; }
.result-box {
    background: #f9f9f9;
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.result-box.accent { background: #1a1a2e; }
.result-box.accent .result-label { color: rgba(255,255,255,0.7); }
.result-box.accent .result-value { color: #fff; }
.result-label { font-size: 0.8rem; color: #777; }
.result-value { font-size: 1.25rem; font-weight: 700; color: #1a1a2e; }
.result-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.result-mini {
    background: #fff3e0;
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.result-mini .result-value { color: #e67e22; font-size: 1.5rem; }

/* ===== KPI Tool ===== */
.kpi-summary {
    margin-top: 1.5rem;
    background: #1a1a2e;
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    color: rgba(255,255,255,0.7);
    font-size: 0.8rem;
    font-weight: 600;
}
.kpi-total { font-size: 2rem; font-weight: 800; color: #fff; }

.kpi-channels { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.kpi-channel {
    background: #f5f5f5;
    border-radius: 8px;
    padding: 1.25rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}
.kpi-channel h4 { font-size: 0.8rem; color: #555; }
.kpi-channel-value { font-size: 2rem; font-weight: 800; color: #1a1a2e; }
.kpi-channel-desc { font-size: 0.75rem; color: #999; }
.kpi-channel-pct { font-size: 0.75rem; color: #777; }
.loyalty-channel { background: #fff3e0; }
.loyalty-channel .kpi-channel-value { color: #e67e22; }

.kpi-breakdown { display: flex; flex-direction: column; gap: 0.5rem; }
.kpi-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    background: #f9f9f9;
    border-radius: 6px;
}
.kpi-row-label { font-size: 0.85rem; display: flex; align-items: center; gap: 0.5rem; }
.kpi-row-value { font-weight: 600; font-size: 0.85rem; }

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}
.red-dot { background: #e74c3c; }
.orange-dot { background: #e67e22; }
.yellow-dot { background: #f1c40f; }
.purple-dot { background: #8e24aa; }
.green-dot2 { background: #27ae60; }

/* ===== Gantt Chart ===== */
.gantt-inputs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.gantt-inputs .input-group { flex: 1; margin-bottom: 0; }
.gantt-chart { margin-top: 1rem; }
.gantt-header {
    display: flex;
    align-items: center;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #eee;
    margin-bottom: 0.5rem;
}
.gantt-label {
    width: 180px;
    flex-shrink: 0;
    font-size: 0.8rem;
    font-weight: 500;
    color: #555;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.gantt-days {
    flex: 1;
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: #999;
}
.gantt-row {
    display: flex;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid #f5f5f5;
}
.gantt-bar-area {
    flex: 1;
    height: 20px;
    position: relative;
    background: #f9f9f9;
    border-radius: 4px;
}
.gantt-bar {
    position: absolute;
    top: 2px;
    height: 16px;
    border-radius: 3px;
}
.yellow-bar { background: #f1c40f; }
.green-bar { background: #27ae60; }
.gray-bar { background: #bdc3c7; }
.orange-bar { background: #e67e22; }
.gantt-legend {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
    justify-content: center;
    font-size: 0.75rem;
    color: #777;
}
.gantt-legend span { display: flex; align-items: center; gap: 0.35rem; }
.legend-box { width: 14px; height: 14px; border-radius: 3px; }
.gray-bg { background: #bdc3c7; }
.yellow-bg { background: #f1c40f; }
.green-bg { background: #27ae60; }

/* ===== Key to Win ===== */
.key-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
}
.key-card {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid #eee;
    text-align: center;
}
.key-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    display: block;
}
.key-card h4 { font-size: 0.95rem; margin-bottom: 0.5rem; color: #1a1a2e; }
.key-card p { font-size: 0.85rem; color: #777; }

/* ===== Timeline ===== */
.timeline {
    position: relative;
    padding-left: 2rem;
}
.timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #eee;
}
.timeline-item {
    position: relative;
    padding-bottom: 2rem;
}
.timeline-dot {
    position: absolute;
    left: -2rem;
    top: 0.25rem;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #ddd;
    border: 3px solid #fff;
    box-shadow: 0 0 0 2px #ddd;
}
.timeline-dot.active {
    background: #e67e22;
    box-shadow: 0 0 0 2px #e67e22;
}
.timeline-content h4 { font-size: 1.1rem; color: #1a1a2e; }
.timeline-period {
    display: inline-block;
    font-size: 0.8rem;
    color: #e67e22;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.timeline-tasks {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}
.timeline-tasks span {
    background: #f5f5f5;
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    font-size: 0.8rem;
    color: #555;
}

/* ===== Retention Chart ===== */
.retention-chart {
    display: flex;
    align-items: flex-end;
    gap: 1rem;
    height: 180px;
    padding: 1rem 0;
}
.retention-bar {
    flex: 1;
    background: linear-gradient(to top, #e67e22, #f9c74f);
    border-radius: 6px 6px 0 0;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 0.5rem;
    min-height: 20px;
    transition: height 0.5s ease;
}
.retention-bar span { font-size: 0.75rem; font-weight: 700; color: #fff; }
.retention-labels {
    display: flex;
    justify-content: space-around;
    font-size: 0.75rem;
    color: #999;
}

/* ===== Conversion Targets ===== */
.conversion-targets { display: flex; flex-direction: column; gap: 0.75rem; margin-bottom: 1.5rem; }
.conv-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: #f5f5f5;
    border-radius: 8px;
}
.conv-value { font-weight: 700; color: #27ae60; }

.big-kpi {
    background: #f9f9f9;
    border-radius: 8px;
    padding: 1.25rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.big-kpi-label { font-size: 0.85rem; color: #777; }
.big-kpi-value { font-size: 2rem; font-weight: 800; color: #27ae60; }

/* ===== KPI Final Grid ===== */
.kpi-final-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin-top: 2rem;
}
.kpi-final-card {
    background: #fff;
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    border: 1px solid #eee;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.kpi-final-value { font-size: 2rem; font-weight: 800; }
.kpi-final-label { font-size: 0.85rem; color: #777; }

/* ===== Budget Table ===== */
.budget-table { min-width: 850px; }
.budget-table th { font-size: 0.75rem; text-align: center; white-space: nowrap; padding: 0.6rem 0.5rem; }
.budget-table td { text-align: center; padding: 0.4rem 0.3rem; font-size: 0.85rem; }
.budget-table td:first-child { text-align: left; font-weight: 600; padding-left: 0.75rem; }
.budget-table input.cell-input {
    width: 90px;
    padding: 0.35rem 0.4rem;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    text-align: right;
    font-size: 0.8rem;
    background: #fff;
    outline: none;
    transition: border-color 0.2s;
}
.budget-table input.cell-input:focus { border-color: #e67e22; background: #fffaf0; }
.budget-table .computed { font-weight: 600; color: #1a1a2e; }
.budget-table .computed-revenue { font-weight: 700; color: #27ae60; }
.budget-table tfoot td { font-size: 0.9rem; padding: 0.75rem 0.5rem; }
.roi-row td { background: #fdf6ec; border-top: none; }

/* ===== Footer ===== */
.footer {
    background: #f5f5f5;
    padding: 2rem 0;
    text-align: center;
}
.footer p { color: #999; font-size: 0.85rem; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .two-col, .tool-grid, .kpi-channels { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .audience-grid { grid-template-columns: repeat(3, 1fr); }
    .rfm-grid { grid-template-columns: repeat(3, 1fr); }
    .key-grid { grid-template-columns: repeat(2, 1fr); }
    .kpi-final-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2.2rem; }
    .section-header h2 { font-size: 1.3rem; }
    .revenue-amount { font-size: 1.8rem; }
}

@media (max-width: 600px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 1rem 1.5rem;
        border-bottom: 1px solid #eee;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: flex; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .audience-grid { grid-template-columns: repeat(2, 1fr); }
    .rfm-grid { grid-template-columns: repeat(2, 1fr); }
    .key-grid { grid-template-columns: 1fr; }
    .gantt-label { width: 120px; font-size: 0.7rem; }
    .gantt-inputs { flex-direction: column; }
    .section { padding: 2.5rem 0; }
    .hero h1 { font-size: 1.8rem; }
    .hero { min-height: 350px; }
}