/* ================================================
   TOOL TINH PHI SAN - STYLE.CSS
   Design: Orange/Pink/White + Dark Dashboard Table
   ================================================ */

:root {
  --primary: #ff6b35;
  --primary-light: #ff8c61;
  --primary-dark: #e55a24;
  --secondary: #ff4d88;
  --secondary-light: #ff79a8;
  --accent: #ffb347;
  --tiktok: #2d2d3a;
  --tiktok-accent: #69c0ff;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg: #fafafa;
  --bg-section: #f4f6f9;
  --white: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --border: #e5e7eb;
  --border-focus: #ff6b35;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --radius: 16px;
  --radius-lg: 24px;
  --radius-sm: 10px;
  --font: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, sans-serif;
  /* Dark Table Palette */
  --dt-bg: #0d1117;
  --dt-header: #0a1929;
  --dt-header-text: #7dd3fc;
  --dt-border: #1e3a5f;
  --dt-row-odd: #111827;
  --dt-row-even: #0f1823;
  --dt-row-hover: #162033;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== UTILITIES ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: 12px;
  font-family: var(--font); font-weight: 600; font-size: 0.9rem;
  cursor: pointer; border: none; text-decoration: none;
  transition: all 0.2s ease; white-space: nowrap;
}
.btn-lg { padding: 13px 22px; font-size: 0.95rem; border-radius: 14px; }
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white; box-shadow: 0 4px 15px rgba(255,107,53,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(255,107,53,0.4); }
.btn-shopee {
  background: linear-gradient(135deg, #ee4d2d, #ff6b35);
  color: white; box-shadow: 0 4px 15px rgba(238,77,45,0.3); font-size: 1rem; padding: 14px 28px;
}
.btn-shopee:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(238,77,45,0.4); }
.btn-tiktok {
  background: linear-gradient(135deg, #1a1a2e, #2d2d3a);
  color: #69c0ff; border: 1px solid #69c0ff40; font-size: 1rem; padding: 14px 28px;
}
.btn-tiktok:hover { background: linear-gradient(135deg, #2d2d3a, #3d3d4a); transform: translateY(-2px); }
.btn-tiktok-solid {
  background: linear-gradient(135deg, #1a1a2e, #2d2d3a);
  color: #69c0ff; border: 1px solid #69c0ff60;
}
.btn-tiktok-solid:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(105,192,255,0.2); }
.btn-outline {
  background: transparent; color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: white; }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #16a34a; transform: translateY(-1px); }
.btn-ghost { background: var(--bg-section); color: var(--text-secondary); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--border); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #dc2626; }

/* ===== HEADER ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex; align-items: center; gap: 24px;
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; flex-shrink: 0;
}
.logo-icon { font-size: 1.4rem; }
.logo-text {
  font-size: 1.05rem; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.main-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-link {
  padding: 8px 14px; border-radius: 10px;
  text-decoration: none; font-weight: 500; font-size: 0.9rem;
  color: var(--text-secondary); transition: all 0.2s;
}
.nav-link:hover { background: var(--bg-section); color: var(--primary); }
.header-cta { margin-left: 12px; font-size: 0.85rem; padding: 8px 18px; }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 6px;
}
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: all 0.3s; }

/* ===== HERO ===== */
.hero-section {
  position: relative; overflow: hidden;
  background: linear-gradient(145deg, #fff8f5 0%, #fff0f5 40%, #f0f4ff 100%);
  padding: 80px 0 100px;
}
.hero-bg-shapes { position: absolute; inset: 0; pointer-events: none; }
.shape {
  position: absolute; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  opacity: 0.07; filter: blur(60px);
}
.shape-1 { width: 500px; height: 500px; top: -200px; right: -100px; }
.shape-2 { width: 300px; height: 300px; bottom: -100px; left: -80px; opacity: 0.05; }
.shape-3 { width: 200px; height: 200px; top: 100px; left: 30%; opacity: 0.04; }
.hero-content { position: relative; text-align: center; max-width: 780px; margin: 0 auto; }
.hero-badge {
  display: inline-block; padding: 6px 18px; border-radius: 100px;
  background: linear-gradient(135deg, rgba(255,107,53,0.12), rgba(255,77,136,0.12));
  border: 1px solid rgba(255,107,53,0.2);
  font-size: 0.85rem; font-weight: 600; color: var(--primary);
  margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900; line-height: 1.2;
  color: var(--text); margin-bottom: 20px;
}
.hero-desc {
  font-size: 1.1rem; color: var(--text-secondary);
  max-width: 580px; margin: 0 auto 36px; line-height: 1.7;
}
.hero-btns {
  display: flex; flex-wrap: wrap; gap: 14px;
  justify-content: center; margin-bottom: 48px;
}
.hero-stats {
  display: flex; align-items: center; justify-content: center; gap: 32px;
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.stat-num {
  font-size: 2rem; font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.stat-label { font-size: 0.8rem; color: var(--text-secondary); font-weight: 500; }
.stat-divider { width: 1px; height: 40px; background: var(--border); }

/* ===== SECTIONS ===== */
.section-header { text-align: center; margin-bottom: 40px; }
.section-title { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 800; margin-bottom: 10px; color: var(--text); }
.section-desc { font-size: 1rem; color: var(--text-secondary); }

/* ===== TOOL SECTION ===== */
.tool-section { padding: 80px 0; background: var(--bg); }
.quick-config-bar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 20px;
  margin-bottom: 24px; box-shadow: var(--shadow-sm);
}
.quick-config-label { font-weight: 700; font-size: 0.9rem; color: var(--text); flex-shrink: 0; }
.config-btn {
  padding: 6px 14px; border-radius: 8px; font-size: 0.82rem;
  font-weight: 600; border: 1px solid var(--border);
  background: transparent; color: var(--text-secondary);
  cursor: pointer; transition: all 0.2s; font-family: var(--font);
}
.config-btn:hover { border-color: var(--primary); color: var(--primary); background: rgba(255,107,53,0.05); }
.config-btn.active { background: linear-gradient(135deg, var(--primary), var(--secondary)); color: white; border-color: transparent; box-shadow: 0 2px 8px rgba(255,107,53,0.25); }

.tab-switcher {
  display: flex; gap: 4px;
  background: var(--bg-section);
  border-radius: 14px; padding: 4px;
  margin-bottom: 24px; width: fit-content;
}
.tab-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 24px; border-radius: 11px;
  font-weight: 600; font-size: 0.95rem;
  border: none; background: transparent;
  color: var(--text-secondary); cursor: pointer;
  transition: all 0.25s ease; font-family: var(--font);
}
.tab-btn.active {
  background: white; color: var(--primary);
  box-shadow: var(--shadow);
}
.tab-icon { font-size: 1.1rem; }

.tool-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  overflow: hidden;
}
.tab-content { display: none; animation: fadeIn 0.3s ease; }
.tab-content.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.tool-grid {
  display: grid; grid-template-columns: 1fr 1fr; min-height: 600px;
}
.input-panel {
  padding: 32px; border-right: 1px solid var(--border);
  overflow-y: auto; max-height: 85vh;
}
.result-panel {
  padding: 32px; background: linear-gradient(145deg, #fafbff, #f8f5ff);
  overflow-y: auto; max-height: 85vh;
}
.panel-title {
  font-size: 1.05rem; font-weight: 800; color: var(--text);
  margin-bottom: 24px; padding-bottom: 14px;
  border-bottom: 2px solid var(--border);
}

/* ===== INPUTS ===== */
.input-group-section { margin-bottom: 24px; }
.input-section-label {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--primary); margin-bottom: 12px;
  padding: 4px 0; border-bottom: 1px solid rgba(255,107,53,0.15);
}
.input-row { display: flex; gap: 12px; }
.input-row.two-col > * { flex: 1; min-width: 0; }
.input-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.input-group label {
  font-size: 0.82rem; font-weight: 600; color: var(--text);
}
.input-group input, .input-group select {
  padding: 11px 14px; border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  font-family: var(--font); font-size: 0.92rem; color: var(--text);
  background: var(--white); transition: all 0.2s; outline: none; width: 100%;
}
.input-group input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(255,107,53,0.12); }
.input-group input::placeholder { color: var(--text-light); }
.input-addon-wrap { display: flex; gap: 0; }
.input-addon-wrap input {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  border-right: none; flex: 1;
}
.input-addon-wrap select {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  border-left: none; width: auto; min-width: 70px;
  background: var(--bg-section); cursor: pointer;
}
.action-buttons {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin-top: 24px; padding-top: 20px;
  border-top: 1px solid var(--border);
}

/* ===== RESULT PANEL ===== */
.result-placeholder {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; height: 300px; color: var(--text-light);
}
.placeholder-icon { font-size: 4rem; margin-bottom: 16px; opacity: 0.5; }
.result-placeholder p { font-size: 0.95rem; max-width: 260px; line-height: 1.6; }
.result-status-bar {
  border-radius: 12px; padding: 12px 16px; margin-bottom: 20px;
  font-weight: 700; font-size: 0.95rem; text-align: center;
  display: none;
}
.status-loss { background: rgba(239,68,68,0.12); color: var(--danger); border: 1px solid rgba(239,68,68,0.2); display: block; }
.status-low { background: rgba(245,158,11,0.12); color: var(--warning); border: 1px solid rgba(245,158,11,0.2); display: block; }
.status-good { background: rgba(34,197,94,0.12); color: var(--success); border: 1px solid rgba(34,197,94,0.2); display: block; }
.result-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 24px;
}
.result-card {
  background: var(--white); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 14px 16px;
  display: flex; flex-direction: column; gap: 6px;
  box-shadow: var(--shadow-sm);
}
.result-card.highlight {
  background: linear-gradient(135deg, rgba(255,107,53,0.06), rgba(255,77,136,0.06));
  border-color: rgba(255,107,53,0.2);
}
.result-card.highlight-profit {
  background: linear-gradient(135deg, rgba(34,197,94,0.06), rgba(16,185,129,0.06));
  border-color: rgba(34,197,94,0.2); grid-column: span 2;
}
.result-label { font-size: 0.78rem; font-weight: 600; color: var(--text-secondary); }
.result-value { font-size: 1.05rem; font-weight: 800; color: var(--text); }
.highlight-profit .result-value { font-size: 1.4rem; color: var(--success); }
.warning-val { color: var(--warning) !important; }
.suggest-val { color: var(--primary) !important; }
.profit-val.loss { color: var(--danger) !important; }
.profit-val.low { color: var(--warning) !important; }
.profit-val.good { color: var(--success) !important; }

/* ===== BREAKDOWN ===== */
.breakdown-section {
  background: var(--bg-section); border-radius: var(--radius-sm);
  border: 1px solid var(--border); margin-bottom: 20px; overflow: hidden;
}
.breakdown-title {
  padding: 12px 16px; font-weight: 700; font-size: 0.88rem; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  user-select: none; transition: background 0.2s;
}
.breakdown-title:hover { background: rgba(255,107,53,0.05); }
.toggle-arrow { transition: transform 0.3s; font-size: 0.7rem; color: var(--text-secondary); }
.breakdown-body { border-top: 1px solid var(--border); max-height: 300px; overflow-y: auto; }
.breakdown-body.collapsed { display: none; }
.breakdown-table { width: 100%; border-collapse: collapse; }
.breakdown-table tr { border-bottom: 1px solid var(--border); }
.breakdown-table tr:last-child { border-bottom: none; }
.breakdown-table td { padding: 8px 16px; font-size: 0.83rem; }
.breakdown-table td:first-child { color: var(--text-secondary); font-weight: 500; }
.breakdown-table td:last-child { font-weight: 700; text-align: right; }
.breakdown-table .bd-total td { font-weight: 800; color: var(--primary); background: rgba(255,107,53,0.04); }

/* ===== CHART ===== */
.chart-section { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; }
.chart-title { font-size: 0.85rem; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.chart-wrap { display: flex; justify-content: center; }

/* ===== WARNING ===== */
.warning-note {
  display: flex; align-items: flex-start; gap: 12px;
  background: linear-gradient(135deg, #fff8e1, #fff3e0);
  border: 1px solid #ffd54f; border-radius: var(--radius);
  padding: 16px 20px; margin-top: 24px;
}
.warning-icon { font-size: 1.2rem; flex-shrink: 0; margin-top: 2px; }
.warning-note p { font-size: 0.88rem; color: #78350f; line-height: 1.6; }

/* ===== DARK RESULTS TABLE ===== */
.results-section { padding: 80px 0; background: var(--bg-section); }
.results-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 24px; flex-wrap: wrap; margin-bottom: 28px;
}
.table-actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; flex-shrink: 0; }
.dark-table-wrapper {
  border-radius: 16px; overflow: hidden;
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
  border: 1px solid var(--dt-border);
}
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; background: var(--dt-bg); }
.dark-results-table {
  width: 100%; border-collapse: collapse;
  min-width: 1800px; background: var(--dt-bg);
}
.dark-results-table thead tr {
  background: var(--dt-header); height: 54px;
  position: sticky; top: 0; z-index: 2;
}
.dark-results-table thead th {
  padding: 0 14px; text-align: center;
  font-size: 0.72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--dt-header-text);
  border-right: 1px solid var(--dt-border);
  border-bottom: 2px solid var(--dt-border);
  white-space: nowrap;
}
.dark-results-table thead th:last-child { border-right: none; }
.dark-results-table tbody tr { transition: background 0.15s; border-bottom: 1px solid var(--dt-border); }
.dark-results-table tbody tr:nth-child(odd) { background: var(--dt-row-odd); }
.dark-results-table tbody tr:nth-child(even) { background: var(--dt-row-even); }
.dark-results-table tbody tr:hover { background: var(--dt-row-hover); }
.dark-results-table tbody td {
  padding: 10px 14px; text-align: center;
  font-size: 0.82rem; color: #d1d5db;
  border-right: 1px solid rgba(30,58,95,0.4);
  white-space: nowrap;
}
.dark-results-table tbody td:last-child { border-right: none; }
.dark-results-table .empty-row td {
  text-align: center; color: #4b5563;
  padding: 40px; font-style: italic; font-size: 0.9rem;
}
.dt-profit-good { color: #4ade80 !important; font-weight: 700; }
.dt-profit-low { color: #fbbf24 !important; font-weight: 700; }
.dt-profit-loss { color: #f87171 !important; font-weight: 700; }
.dt-stt { color: #94a3b8; font-size: 0.75rem; }
.dt-datetime { color: #94a3b8; font-size: 0.75rem; }
.dt-sku { color: #e2e8f0; font-weight: 600; text-align: left !important; }
.dt-shop { color: #93c5fd; font-weight: 500; }
.dt-delete-btn {
  padding: 4px 10px; border-radius: 6px; font-size: 0.75rem;
  background: rgba(239,68,68,0.15); color: #f87171;
  border: 1px solid rgba(239,68,68,0.2); cursor: pointer; font-family: var(--font);
  transition: all 0.2s; font-weight: 600;
}
.dt-delete-btn:hover { background: var(--danger); color: white; }

/* ===== GUIDE ===== */
.guide-section { padding: 80px 0; background: var(--bg); }
.steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.step-card {
  background: var(--white); border-radius: var(--radius);
  padding: 32px 24px; text-align: center;
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden; transition: transform 0.2s, box-shadow 0.2s;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.step-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}
.step-num {
  font-size: 3rem; font-weight: 900; line-height: 1;
  background: linear-gradient(135deg, rgba(255,107,53,0.15), rgba(255,77,136,0.15));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 8px;
}
.step-icon { font-size: 2rem; margin-bottom: 12px; }
.step-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.step-card p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== BENEFITS ===== */
.benefits-section { padding: 80px 0; background: linear-gradient(145deg, #fff8f5, #fff5fb); }
.benefits-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.benefit-card {
  background: var(--white); border-radius: var(--radius);
  padding: 28px 20px; text-align: center;
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
  transition: all 0.25s;
}
.benefit-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--primary); }
.benefit-icon { font-size: 2.5rem; margin-bottom: 14px; }
.benefit-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 10px; }
.benefit-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== FAQ ===== */
.faq-section { padding: 80px 0; background: var(--bg); }
.faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--white); border-radius: var(--radius);
  border: 1px solid var(--border); overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.faq-question {
  width: 100%; display: flex; justify-content: space-between; align-items: center;
  padding: 18px 20px; background: none; border: none; cursor: pointer;
  font-family: var(--font); font-size: 0.95rem; font-weight: 700; color: var(--text);
  text-align: left; transition: background 0.2s; gap: 12px;
}
.faq-question:hover { background: rgba(255,107,53,0.04); }
.faq-arrow { font-size: 0.7rem; color: var(--text-secondary); transition: transform 0.3s; flex-shrink: 0; }
.faq-question.open .faq-arrow { transform: rotate(180deg); }
.faq-answer { padding: 0 20px; max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.2s; }
.faq-answer.open { max-height: 300px; padding: 0 20px 18px; }
.faq-answer p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

/* ===== FOOTER ===== */
.site-footer { background: var(--text); color: white; padding: 48px 0 0; }
.footer-inner { display: flex; align-items: flex-start; justify-content: space-between; gap: 40px; flex-wrap: wrap; padding-bottom: 40px; }
.footer-brand { display: flex; flex-direction: column; gap: 6px; }
.footer-logo-text { font-size: 1.1rem; font-weight: 800; color: white; margin-left: 8px; }
.footer-brand > :first-child { display: flex; align-items: center; }
.footer-desc { font-size: 0.85rem; color: rgba(255,255,255,0.5); max-width: 280px; line-height: 1.6; margin-top: 4px; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: rgba(255,255,255,0.6); text-decoration: none; font-size: 0.9rem; transition: color 0.2s; }
.footer-links a:hover { color: var(--primary); }
.footer-copyright { background: rgba(255,255,255,0.05); border-top: 1px solid rgba(255,255,255,0.08); padding: 16px 0; font-size: 0.82rem; color: rgba(255,255,255,0.4); }

/* ===== TOAST ===== */
.toast {
  position: fixed; bottom: 24px; right: 24px; z-index: 9999;
  padding: 14px 22px; border-radius: 12px;
  font-size: 0.9rem; font-weight: 600; color: white;
  background: var(--text); box-shadow: var(--shadow-xl);
  transform: translateY(80px); opacity: 0;
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none; max-width: 320px;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.info { background: var(--primary); }

/* ===== SCROLLBAR ===== */
.input-panel::-webkit-scrollbar, .result-panel::-webkit-scrollbar, .table-scroll::-webkit-scrollbar { width: 6px; height: 6px; }
.input-panel::-webkit-scrollbar-track, .result-panel::-webkit-scrollbar-track { background: transparent; }
.input-panel::-webkit-scrollbar-thumb, .result-panel::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.table-scroll::-webkit-scrollbar-track { background: var(--dt-bg); }
.table-scroll::-webkit-scrollbar-thumb { background: var(--dt-border); border-radius: 3px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .benefits-grid { grid-template-columns: repeat(2, 1fr); }
  .tool-grid { grid-template-columns: 1fr; }
  .input-panel { border-right: none; border-bottom: 1px solid var(--border); max-height: none; }
  .result-panel { max-height: none; }
}
@media (max-width: 768px) {
  .hero-section { padding: 60px 0 80px; }
  .hero-btns { flex-direction: column; align-items: stretch; }
  .main-nav { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: white; padding: 16px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-lg); z-index: 99; }
  .main-nav.open { display: flex; }
  .hamburger { display: flex; }
  .header-cta { display: none; }
  .steps-grid { grid-template-columns: 1fr; }
  .benefits-grid { grid-template-columns: 1fr 1fr; }
  .results-header { flex-direction: column; }
  .tab-btn { padding: 8px 14px; font-size: 0.85rem; }
  .result-grid { grid-template-columns: 1fr; }
  .result-card.highlight-profit { grid-column: span 1; }
  .hero-stats { gap: 20px; }
  .stat-divider { display: none; }
  .action-buttons { flex-direction: column; }
  .action-buttons .btn { width: 100%; justify-content: center; }
}
@media (max-width: 480px) {
  .benefits-grid { grid-template-columns: 1fr; }
  .input-row.two-col { flex-direction: column; gap: 0; }
  .tool-section, .guide-section, .benefits-section, .faq-section, .results-section { padding: 60px 0; }
  .container { padding: 0 16px; }
  .quick-config-bar { flex-wrap: wrap; }
}

/* Reference link inside label */
.ref-link {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px dashed var(--primary);
  margin-left: 4px;
  transition: color 0.2s, border-color 0.2s;
}
.ref-link:hover {
  color: var(--secondary);
  border-color: var(--secondary);
}