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

:root {
    --indigo-50: #eef2ff;
    --indigo-100: #e0e7ff;
    --indigo-500: #6366f1;
    --indigo-600: #4f46e5;
    --indigo-700: #4338ca;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-900: #111827;
    --red-50: #fef2f2;
    --red-600: #dc2626;
    --green-100: #d1fae5;
    --green-600: #16a34a;
    --white: #ffffff;
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
}

body { font-family: 'Inter', system-ui, -apple-system, sans-serif; color: var(--gray-900); line-height: 1.6; background: var(--white); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
@media (min-width: 768px) { .container { padding: 0 24px; } }

/* Navbar */
.navbar { border-bottom: 1px solid var(--gray-100); background: var(--white); position: relative; }
.nav-content { display: flex; align-items: center; justify-content: space-between; padding: 16px 24px; }
.logo { display: flex; align-items: center; gap: 8px; }
.logo-icon { display: flex; align-items: center; justify-content: center; width: 32px; height: 32px; border-radius: 8px; background: var(--indigo-600); color: var(--white); }
.logo-text { font-size: 20px; font-weight: 700; color: var(--gray-900); }

.nav-right { display: flex; align-items: center; gap: 8px; }

/* Burger */
.nav-burger { display: flex; flex-direction: column; justify-content: center; align-items: center; width: 38px; height: 38px; background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: 8px; cursor: pointer; gap: 5px; padding: 0; transition: all 0.2s; }
.nav-burger:hover { background: var(--gray-100); }
.nav-burger span { display: block; width: 18px; height: 2px; background: var(--gray-700); border-radius: 2px; transition: all 0.3s; }
.nav-burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger.active span:nth-child(2) { opacity: 0; }
.nav-burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Side panel (all screens) */
.nav-auth { display: flex; flex-direction: column; position: fixed; top: 0; right: -300px; width: 280px; height: 100vh; background: var(--white); box-shadow: -4px 0 20px rgba(0,0,0,0.12); padding: 80px 24px 24px; gap: 4px; transition: right 0.3s ease; z-index: 200; }
.nav-auth.open { right: 0; }
.nav-auth-link { font-size: 15px; font-weight: 500; color: var(--gray-700); text-decoration: none; padding: 14px 16px; border-radius: 8px; transition: all 0.2s; }
.nav-auth-link:hover { background: var(--indigo-50); color: var(--indigo-600); }
.nav-logout { color: var(--red-600) !important; }
.nav-logout:hover { background: var(--red-50) !important; color: var(--red-600) !important; }

.mobile-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 150; }
.mobile-overlay.show { display: block; }

/* Language Selector */
.lang-selector { position: relative; }
.lang-btn { display: flex; align-items: center; gap: 6px; padding: 8px 12px; background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: 8px; font-size: 14px; font-weight: 500; color: var(--gray-700); cursor: pointer; transition: all 0.2s; }
.lang-btn:hover { background: var(--gray-100); }
.lang-dropdown { display: none; position: absolute; top: calc(100% + 6px); right: 0; min-width: 180px; background: var(--white); border: 1px solid var(--gray-200); border-radius: 10px; box-shadow: var(--shadow-lg); overflow: hidden; z-index: 250; }
.lang-dropdown.show { display: block; }
.lang-item { display: flex; align-items: center; gap: 8px; width: 100%; padding: 10px 14px; background: none; border: none; font-size: 14px; color: var(--gray-700); cursor: pointer; text-align: left; transition: all 0.15s; }
.lang-item:hover { background: var(--indigo-50); color: var(--indigo-600); }
.lang-item.active { background: var(--indigo-600); color: var(--white); font-weight: 600; }
.lang-item.active:hover { background: var(--indigo-700); color: var(--white); }

/* Hero */
.hero { position: relative; overflow: hidden; background: linear-gradient(to bottom, var(--indigo-50), var(--white)); padding: 48px 0 64px; }
@media (min-width: 640px) { .hero { padding: 64px 0 96px; } }

.hero-grid { display: grid; gap: 40px; align-items: start; }
@media (min-width: 1024px) { .hero-grid { grid-template-columns: 1fr 1fr; gap: 64px; } }

.badge { display: inline-flex; align-items: center; gap: 8px; padding: 6px 16px; border-radius: 9999px; background: var(--indigo-100); font-size: 14px; font-weight: 500; color: var(--indigo-700); margin-bottom: 24px; }
.badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--indigo-600); }

.hero h1 { font-size: 32px; font-weight: 800; letter-spacing: -0.025em; line-height: 1.2; color: var(--gray-900); }
@media (min-width: 640px) { .hero h1 { font-size: 44px; } }
@media (min-width: 1024px) { .hero h1 { font-size: 56px; } }

.gradient-text { background: linear-gradient(to right, var(--indigo-600), #7c3aed); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

.hero > .container > .hero-grid > .hero-text > p { margin-top: 20px; font-size: 17px; color: var(--gray-600); }

.steps { margin-top: 32px; display: flex; flex-direction: column; gap: 14px; }
.step { display: flex; align-items: center; gap: 14px; }
.step-number { display: flex; align-items: center; justify-content: center; width: 30px; height: 30px; border-radius: 50%; background: var(--indigo-600); color: var(--white); font-size: 14px; font-weight: 700; flex-shrink: 0; }
.step span { font-weight: 500; color: var(--gray-700); }

.features-preview { margin-top: 24px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.feature-preview { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 500; color: var(--gray-700); }
.feature-preview svg { color: var(--indigo-600); flex-shrink: 0; }

/* Form Card */
.form-card { background: var(--white); border-radius: 16px; padding: 24px; box-shadow: var(--shadow-xl), 0 0 60px -15px rgba(99,102,241,0.15); border: 1px solid var(--gray-100); }
@media (min-width: 768px) { .form-card { padding: 32px; } }

.form-card h2 { font-size: 18px; font-weight: 700; color: var(--gray-900); margin-bottom: 20px; }
@media (min-width: 768px) { .form-card h2 { font-size: 20px; } }

.form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 14px; font-weight: 600; color: var(--gray-700); }
.optional { font-weight: 400; color: var(--gray-400); }
.form-group input { width: 100%; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--gray-200); font-size: 15px; color: var(--gray-900); background: var(--white); transition: border-color 0.2s, box-shadow 0.2s; outline: none; }
.form-group input::placeholder { color: var(--gray-400); }
.form-group input:focus { border-color: var(--indigo-500); box-shadow: 0 0 0 3px rgba(99,102,241,0.15); }
.form-group select { width: 100%; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--gray-200); font-size: 15px; color: var(--gray-900); background: var(--white); transition: border-color 0.2s, box-shadow 0.2s; outline: none; cursor: pointer; appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 36px; }
.form-group select:focus { border-color: var(--indigo-500); box-shadow: 0 0 0 3px rgba(99,102,241,0.15); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (min-width: 480px) { .form-row { gap: 16px; } }

.form-divider { display: flex; align-items: center; gap: 12px; padding: 8px 0; }
.form-divider::before, .form-divider::after { content: ''; flex: 1; height: 1px; background: var(--gray-200); }
.form-divider span { font-size: 13px; font-weight: 600; color: var(--gray-500); white-space: nowrap; }

.btn-primary { width: 100%; padding: 14px 24px; border-radius: 12px; background: var(--indigo-600); color: var(--white); font-size: 15px; font-weight: 600; border: none; cursor: pointer; box-shadow: var(--shadow-lg), 0 0 20px -5px rgba(99,102,241,0.3); transition: background 0.2s, transform 0.1s; display: flex; align-items: center; justify-content: center; gap: 8px; text-decoration: none; }
.btn-primary:hover { background: var(--indigo-700); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.7; cursor: not-allowed; }

.form-note { text-align: center; font-size: 12px; color: var(--gray-400); }

.error-msg { background: var(--red-50); padding: 12px; border-radius: 8px; font-size: 14px; color: var(--red-600); }

.spinner { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.spinner circle { stroke: currentColor; opacity: 0.25; }
.spinner path { fill: currentColor; opacity: 0.75; }

/* Modal */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 100; padding: 20px; }
.modal-content { background: var(--white); border-radius: 16px; padding: 32px; max-width: 480px; width: 100%; text-align: center; box-shadow: var(--shadow-xl); max-height: 90vh; overflow-y: auto; }
.success-icon { display: flex; align-items: center; justify-content: center; width: 72px; height: 72px; border-radius: 50%; background: var(--green-100); color: var(--green-600); margin: 0 auto 20px; }
.modal-content h2 { font-size: 22px; font-weight: 700; color: var(--gray-900); margin-bottom: 8px; }
.modal-content p { color: var(--gray-600); margin-bottom: 20px; }

.url-box { background: var(--gray-50); border: 1px solid var(--gray-200); border-radius: 12px; padding: 14px; margin-bottom: 16px; text-align: left; }
.url-label { font-size: 13px; font-weight: 500; color: var(--gray-500); }
.url-link { display: block; margin-top: 6px; font-size: 16px; font-weight: 600; color: var(--indigo-600); text-decoration: none; word-break: break-all; }
.url-link:hover { color: var(--indigo-700); }

.badge-tag { display: inline-block; padding: 4px 10px; border-radius: 9999px; background: #f0fdf4; color: #166534; font-size: 12px; font-weight: 500; }

.modal-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn-secondary { padding: 12px 24px; border-radius: 12px; border: 1px solid var(--gray-200); background: var(--white); font-size: 14px; font-weight: 600; color: var(--gray-700); cursor: pointer; transition: background 0.2s; text-decoration: none; }
.btn-secondary:hover { background: var(--gray-50); }
.modal-actions .btn-primary { width: auto; padding: 12px 24px; font-size: 14px; box-shadow: none; }

.auth-prompt { background: #eff6ff; border: 1px solid #bfdbfe; border-radius: 12px; padding: 16px; margin-bottom: 16px; text-align: left; }
.auth-prompt p { margin-bottom: 8px; }

/* Features */
.features { background: var(--white); padding: 64px 0; }
@media (min-width: 768px) { .features { padding: 96px 0; } }
.section-title { text-align: center; font-size: 26px; font-weight: 700; color: var(--gray-900); margin-bottom: 48px; }
@media (min-width: 768px) { .section-title { font-size: 30px; } }

.features-grid { display: grid; gap: 24px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .features-grid { grid-template-columns: repeat(3, 1fr); } }

.feature-card { background: var(--gray-50); border-radius: 12px; padding: 24px; transition: box-shadow 0.2s; }
.feature-card:hover { box-shadow: var(--shadow-lg); }
.feature-icon { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 8px; background: var(--indigo-100); color: var(--indigo-600); margin-bottom: 12px; }
.feature-card h3 { font-size: 16px; font-weight: 600; color: var(--gray-900); margin-bottom: 6px; }
.feature-card p { font-size: 14px; color: var(--gray-600); line-height: 1.6; }

/* CTA */
.cta { background: var(--indigo-600); padding: 64px 0; text-align: center; }
@media (min-width: 768px) { .cta { padding: 96px 0; } }
.cta h2 { font-size: 26px; font-weight: 700; color: var(--white); }
@media (min-width: 640px) { .cta h2 { font-size: 34px; } }
.cta p { margin-top: 12px; font-size: 17px; color: rgba(255,255,255,0.9); max-width: 600px; margin-left: auto; margin-right: auto; }
.btn-white { display: inline-block; margin-top: 28px; padding: 14px 28px; border-radius: 12px; background: var(--white); color: var(--indigo-600); font-size: 15px; font-weight: 600; text-decoration: none; box-shadow: var(--shadow-lg); transition: background 0.2s; }
.btn-white:hover { background: var(--gray-50); }

/* Footer */
.footer { border-top: 1px solid var(--gray-100); background: var(--white); padding: 32px 0; text-align: center; font-size: 14px; color: var(--gray-500); }

/* Hero blurs */
.hero-bg-blur { position: absolute; border-radius: 50%; filter: blur(80px); pointer-events: none; }
.hero-blur-1 { width: 256px; height: 256px; background: rgba(199,210,254,0.3); top: 25%; left: 25%; }
.hero-blur-2 { width: 256px; height: 256px; background: rgba(221,214,254,0.3); bottom: 25%; right: 25%; }