:root {
    /* Colors */
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #eef2ff;
    --secondary: #0f172a;
    --accent: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --white: #ffffff;
    /* Spacing & Sizing */
    --radius: 8px;
    --radius-lg: 12px;
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
    /* Typography */
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-md: 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font);
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--primary-hover); }
a:focus { outline: 2px solid var(--primary); outline-offset: 2px; }

img { max-width: 100%; display: block; }

/* Accessibility utilities */
.sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0;
    margin: -1px; overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border-width: 0;
}
.focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ===== HEADER / NAV ===== */
.site-header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
    transition: box-shadow 0.3s;
}
.site-header.scrolled { box-shadow: var(--shadow-md); }

.nav-container {
    max-width: 1200px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 24px; height: 64px;
}

.nav-logo {
    font-size: 1.5rem; font-weight: 800; color: var(--secondary);
    letter-spacing: -0.5px;
}
.nav-logo span { color: var(--primary); }

.nav-links { display: flex; align-items: center; gap: 32px; list-style: none; }
.nav-links a { color: var(--gray-600); font-size: 0.9rem; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--primary); }

.nav-actions { display: flex; align-items: center; gap: 12px; }

.hamburger {
    display: none; background: none; border: none; cursor: pointer; padding: 4px;
}
.hamburger span {
    display: block; width: 24px; height: 2px; background: var(--gray-700);
    margin: 5px 0; transition: 0.3s;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 10px 20px; border-radius: var(--radius); font-size: 0.9rem;
    font-weight: 600; cursor: pointer; border: none; transition: all 0.2s;
    text-decoration: none; line-height: 1.4;
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-hover); color: var(--white); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-secondary { background: var(--white); color: var(--gray-700); border: 1px solid var(--gray-300); }
.btn-secondary:hover { background: var(--gray-50); border-color: var(--gray-400); color: var(--gray-700); }
.btn-ghost { background: transparent; color: var(--gray-600); }
.btn-ghost:hover { background: var(--gray-100); color: var(--gray-800); }
.btn-lg { padding: 14px 28px; font-size: 1rem; border-radius: var(--radius-lg); }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-block { width: 100%; }

/* ===== HERO ===== */
.hero {
    padding: 140px 24px 80px;
    text-align: center;
    background: linear-gradient(180deg, var(--primary-light) 0%, var(--white) 100%);
}
.hero-inner { max-width: 800px; margin: 0 auto; }
.hero-badge {
    display: inline-block; padding: 6px 16px; border-radius: 50px;
    background: var(--white); border: 1px solid var(--gray-200);
    font-size: 0.8rem; font-weight: 600; color: var(--primary);
    margin-bottom: 24px;
}
.hero h1 {
    font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800;
    color: var(--secondary); line-height: 1.15; margin-bottom: 20px;
    letter-spacing: -1px;
}
.hero h1 span { color: var(--primary); }
.hero p {
    font-size: 1.15rem; color: var(--gray-500); max-width: 600px;
    margin: 0 auto 32px; line-height: 1.7;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ===== SECTIONS ===== */
.section { padding: 80px 24px; }
.section-alt { background: var(--gray-50); }
.section-inner { max-width: 1100px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-header h2 {
    font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 800;
    color: var(--secondary); margin-bottom: 12px; letter-spacing: -0.5px;
}
.section-header p { font-size: 1.05rem; color: var(--gray-500); max-width: 600px; margin: 0 auto; }

/* ===== FEATURE GRID ===== */
.feature-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}
.feature-card {
    background: var(--white); border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg); padding: 32px;
    transition: all 0.3s;
}
.feature-card:hover { border-color: var(--primary); box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.feature-icon {
    width: 48px; height: 48px; border-radius: var(--radius);
    background: var(--primary-light); display: flex; align-items: center;
    justify-content: center; margin-bottom: 16px; font-size: 1.4rem;
}
.feature-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--secondary); margin-bottom: 8px; }
.feature-card p { font-size: 0.9rem; color: var(--gray-500); line-height: 1.6; }

/* ===== GSMEAC SHOWCASE ===== */
.gsmeac-flow {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px; margin-top: 40px;
}
.gsmeac-step {
    text-align: center; padding: 24px 16px;
    background: var(--white); border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg); transition: all 0.3s;
}
.gsmeac-step:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.gsmeac-letter {
    font-size: 2rem; font-weight: 800; color: var(--primary); margin-bottom: 4px;
}
.gsmeac-step h4 { font-size: 0.85rem; font-weight: 700; color: var(--secondary); margin-bottom: 4px; }
.gsmeac-step p { font-size: 0.75rem; color: var(--gray-500); }

/* ===== PRICING / CTA ===== */
.cta-section {
    padding: 80px 24px; text-align: center;
    background: linear-gradient(135deg, var(--secondary) 0%, #1e1b4b 100%);
    color: var(--white);
}
.cta-section h2 { font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 800; margin-bottom: 12px; }
.cta-section p { font-size: 1.05rem; color: var(--gray-300); margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }

/* ===== CONTACT FORM ===== */
.contact-section { padding: 80px 24px; }
.contact-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 48px;
    max-width: 1000px; margin: 0 auto;
}
.contact-info h3 { font-size: 1.4rem; font-weight: 700; color: var(--secondary); margin-bottom: 16px; }
.contact-info p { color: var(--gray-500); margin-bottom: 24px; line-height: 1.7; }
.contact-detail { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; color: var(--gray-600); font-size: 0.9rem; }
.contact-detail svg { flex-shrink: 0; }

/* ===== FORMS ===== */
.form-group { margin-bottom: 20px; }
.form-label {
    display: block; font-size: 0.85rem; font-weight: 600;
    color: var(--gray-700); margin-bottom: 6px;
}
.form-input, .form-textarea, .form-select {
    width: 100%; padding: 10px 14px; border: 1px solid var(--gray-300);
    border-radius: var(--radius); font-size: 0.9rem; font-family: var(--font);
    color: var(--gray-800); background: var(--white); transition: border-color 0.2s, box-shadow 0.2s;
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
    outline: none; border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}
.form-textarea { resize: vertical; min-height: 120px; }
.form-error { font-size: 0.8rem; color: var(--danger); margin-top: 4px; }
.form-card {
    background: var(--white); border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg); padding: 40px;
    box-shadow: var(--shadow);
}

/* ===== AUTH PAGES ===== */
.auth-page {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    padding: 24px; background: var(--gray-50);
}
.auth-card {
    width: 100%; max-width: 420px; background: var(--white);
    border: 1px solid var(--gray-200); border-radius: var(--radius-lg);
    padding: 40px; box-shadow: var(--shadow-lg);
}
.auth-card h1 {
    font-size: 1.5rem; font-weight: 800; color: var(--secondary);
    margin-bottom: 4px; text-align: center;
}
.auth-card .subtitle {
    text-align: center; color: var(--gray-500); font-size: 0.9rem; margin-bottom: 28px;
}
.auth-divider {
    display: flex; align-items: center; gap: 12px; margin: 20px 0;
    color: var(--gray-400); font-size: 0.8rem;
}
.auth-divider::before, .auth-divider::after {
    content: ''; flex: 1; height: 1px; background: var(--gray-200);
}
.auth-footer { text-align: center; margin-top: 20px; font-size: 0.85rem; color: var(--gray-500); }

/* ===== ALERTS ===== */
.alert {
    padding: 12px 16px; border-radius: var(--radius); font-size: 0.9rem;
    margin-bottom: 20px; border: 1px solid;
}
.alert-success { background: #ecfdf5; border-color: #a7f3d0; color: #065f46; }
.alert-error { background: #fef2f2; border-color: #fecaca; color: #991b1b; }
.alert-info { background: #eff6ff; border-color: #bfdbfe; color: #1e40af; }

/* ===== FOOTER ===== */
.site-footer {
    background: var(--secondary); color: var(--gray-400); padding: 64px 24px 32px;
}
.footer-grid {
    max-width: 1100px; margin: 0 auto;
    display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
    margin-bottom: 48px;
}
.footer-brand p { font-size: 0.85rem; line-height: 1.7; margin-top: 12px; }
.footer-col h4 { color: var(--white); font-size: 0.85rem; font-weight: 700; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 0.5px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--gray-400); font-size: 0.85rem; transition: color 0.2s; }
.footer-col a:hover { color: var(--white); }
.footer-bottom {
    max-width: 1100px; margin: 0 auto;
    padding-top: 24px; border-top: 1px solid var(--gray-700);
    display: flex; justify-content: space-between; align-items: center;
    font-size: 0.8rem;
}
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a { color: var(--gray-400); }
.footer-bottom-links a:hover { color: var(--white); }

/* ===== COOKIE BANNER ===== */
.cookie-banner {
    position: fixed; bottom: 0; left: 0; right: 0; z-index: 9999;
    background: var(--white); border-top: 1px solid var(--gray-200);
    box-shadow: 0 -4px 20px rgba(0,0,0,0.1); padding: 20px 24px;
    display: none;
}
.cookie-banner.active { display: block; }
.cookie-inner {
    max-width: 1100px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    gap: 24px; flex-wrap: wrap;
}
.cookie-text { flex: 1; min-width: 300px; }
.cookie-text p { font-size: 0.85rem; color: var(--gray-600); line-height: 1.6; }
.cookie-text a { color: var(--primary); text-decoration: underline; }
.cookie-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ===== LEGAL PAGES ===== */
.legal-page { padding: 120px 24px 80px; }
.legal-content {
    max-width: 800px; margin: 0 auto;
}
.legal-content h1 { font-size: 2rem; font-weight: 800; color: var(--secondary); margin-bottom: 8px; }
.legal-content .last-updated { font-size: 0.85rem; color: var(--gray-500); margin-bottom: 32px; }
.legal-content h2 { font-size: 1.3rem; font-weight: 700; color: var(--secondary); margin: 32px 0 12px; }
.legal-content h3 { font-size: 1.1rem; font-weight: 600; color: var(--gray-700); margin: 24px 0 8px; }
.legal-content p { color: var(--gray-600); margin-bottom: 16px; line-height: 1.7; }
.legal-content ul { margin: 0 0 16px 24px; color: var(--gray-600); }
.legal-content li { margin-bottom: 6px; line-height: 1.6; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hamburger { display: block; }
    .nav-links.open {
        display: flex; flex-direction: column; position: absolute;
        top: 64px; left: 0; right: 0; background: var(--white);
        border-bottom: 1px solid var(--gray-200); padding: 16px 24px;
        gap: 16px; box-shadow: var(--shadow-lg);
    }
    .hero h1 { font-size: 2rem; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
    .gsmeac-flow { grid-template-columns: repeat(3, 1fr); }
    .hero-actions { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
    .gsmeac-flow { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr; }
    .auth-card { padding: 24px; }
}

/* ===== TOOLTIPS & HELPERS ===== */
.form-hint {
    font-size: 0.78rem; color: var(--gray-400); margin-top: 4px; line-height: 1.5;
}
.form-hint a { color: var(--primary); }
.field-tip {
    display: flex; align-items: flex-start; gap: 6px;
    font-size: 0.78rem; color: var(--gray-400); margin-bottom: 16px; line-height: 1.5;
    background: var(--primary-light); border-radius: var(--radius); padding: 10px 14px;
}
.field-tip::before { content: '\1F4A1'; flex-shrink: 0; }
.section-guide {
    background: var(--primary-light); border: 1px solid rgba(79,70,229,0.15);
    border-radius: var(--radius-lg); padding: 16px 20px; margin-bottom: 20px;
}
.section-guide p { font-size: 0.85rem; color: var(--gray-600); line-height: 1.6; margin: 0; }
.section-guide strong { color: var(--primary); }

/* ===== PASSWORD STRENGTH ===== */
.pw-strength { margin-top: 6px; }
.pw-strength-bar {
    height: 4px; border-radius: 2px; background: var(--gray-200);
    overflow: hidden; margin-bottom: 4px;
}
.pw-strength-fill {
    height: 100%; border-radius: 2px; transition: width 0.3s, background 0.3s;
    width: 0;
}
.pw-strength-text { font-size: 0.75rem; color: var(--gray-400); }
.pw-str-weak .pw-strength-fill { width: 25%; background: var(--danger); }
.pw-str-weak .pw-strength-text { color: var(--danger); }
.pw-str-fair .pw-strength-fill { width: 50%; background: var(--warning); }
.pw-str-fair .pw-strength-text { color: var(--warning); }
.pw-str-good .pw-strength-fill { width: 75%; background: #22c55e; }
.pw-str-good .pw-strength-text { color: #22c55e; }
.pw-str-strong .pw-strength-fill { width: 100%; background: var(--success); }
.pw-str-strong .pw-strength-text { color: var(--success); }

/* ===== TOAST NOTIFICATIONS ===== */
.toast-container {
    position: fixed; top: 80px; right: 24px; z-index: 11000;
    display: flex; flex-direction: column; gap: 8px;
}
.toast {
    padding: 12px 20px; border-radius: var(--radius); font-size: 0.85rem;
    font-weight: 500; box-shadow: var(--shadow-lg); animation: toastIn 0.3s ease;
    display: flex; align-items: center; gap: 8px; max-width: 380px;
}
.toast-success { background: #065f46; color: #fff; }
.toast-error { background: #991b1b; color: #fff; }
.toast-info { background: var(--primary); color: #fff; }
@keyframes toastIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }

/* ===== ONBOARDING / GETTING STARTED ===== */
.onboarding-card {
    background: linear-gradient(135deg, var(--primary-light) 0%, #fff 100%);
    border: 1px solid rgba(79,70,229,0.2); border-radius: var(--radius-lg);
    padding: 28px; margin-bottom: 24px;
}
.onboarding-card h2 { font-size: 1.1rem; font-weight: 700; color: var(--secondary); margin-bottom: 12px; }
.onboarding-card p { font-size: 0.9rem; color: var(--gray-600); margin-bottom: 16px; line-height: 1.6; }
.onboarding-steps {
    display: flex; flex-direction: column; gap: 10px;
}
.onboarding-step {
    display: flex; align-items: center; gap: 12px; font-size: 0.85rem;
    color: var(--gray-600); padding: 8px 12px; border-radius: var(--radius);
    background: rgba(255,255,255,0.7);
}
.onboarding-step .step-num {
    width: 28px; height: 28px; border-radius: 50%; background: var(--primary);
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-size: 0.75rem; font-weight: 700; flex-shrink: 0;
}
.onboarding-step.done .step-num { background: var(--success); }
.onboarding-step.done { color: var(--gray-400); text-decoration: line-through; }

/* ===== EMPTY STATES (enhanced) ===== */
.empty-state-icon { font-size: 2.5rem; margin-bottom: 12px; }
.empty-state h3 { font-size: 1rem; font-weight: 700; color: var(--gray-700); margin-bottom: 6px; }
.empty-state .hint { font-size: 0.82rem; color: var(--gray-400); line-height: 1.6; max-width: 320px; margin: 0 auto 16px; }

/* ===== UNSAVED CHANGES BAR ===== */
.unsaved-bar {
    position: sticky; bottom: 0; left: 0; right: 0; z-index: 100;
    background: var(--warning); color: #78350f; padding: 10px 20px;
    display: none; align-items: center; justify-content: space-between;
    font-size: 0.85rem; font-weight: 600; border-radius: var(--radius) var(--radius) 0 0;
}
.unsaved-bar.visible { display: flex; }

/* ===== KEYBOARD SHORTCUT HINT ===== */
.kbd {
    display: inline-block; padding: 1px 6px; border-radius: 4px;
    background: var(--gray-100); border: 1px solid var(--gray-300);
    font-size: 0.7rem; font-family: monospace; color: var(--gray-600);
}

/* ===== AD CONTAINERS ===== */
/* Ad zone consolidation */
.ad-placeholder {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    margin-bottom: 24px;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-400);
    font-size: 0.85rem;
}
.ad-container { max-width: 1100px; margin: 0 auto; padding: 16px 24px; text-align: center; }
.ad-inline { padding: 24px; }
.ad-footer-banner { background: var(--gray-50); border-top: 1px solid var(--gray-200); padding: 20px 24px; max-width: 100%; }
.ad-sidebar { margin-bottom: 24px; }

/* ===== APP FOOTER (dashboard pages) ===== */
.app-footer {
    background: var(--white); border-top: 1px solid var(--gray-200);
    padding: 20px 28px; margin-top: auto;
}
.app-footer-inner {
    max-width: 1200px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
    font-size: 0.8rem; color: var(--gray-400);
}
.app-footer-links { display: flex; gap: 20px; }
.app-footer-links a { color: var(--gray-400); font-size: 0.8rem; transition: color 0.2s; }
.app-footer-links a:hover { color: var(--gray-600); }
@media (max-width: 768px) {
    .app-footer-inner { flex-direction: column; gap: 8px; text-align: center; }
}