/* ============================================
   BillFast — Landing Page Styles
   A premium SaaS landing page that converts.
   ============================================ */

/* --- Reset & Base --- */
:root {
    --primary: #6B4EFF;
    --primary-dark: #5A3FE0;
    --primary-light: #EDE9FF;
    --surface: #FFFFFF;
    --background: #FAFBFF;
    --surface-variant: #F3F4F8;
    --text-main: #1A1A2E;
    --text-secondary: #6B7280;
    --border: #E5E7EB;
    --gradient-start: #6B4EFF;
    --gradient-end: #9F8CFF;
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] {
    --primary: #8E7BFF;
    --primary-dark: #7A66F0;
    --primary-light: #2D235C;
    --surface: #1E1E2E;
    --background: #111118;
    --surface-variant: #2A2A3C;
    --text-main: #E8E8F0;
    --text-secondary: #9CA3AF;
    --border: #3A3A4C;
    --gradient-start: #6B4EFF;
    --gradient-end: #9F8CFF;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--background);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

a {
    color: var(--primary);
    text-decoration: none;
}

/* --- Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(255, 255, 255, 0.8);
    border-bottom: 1px solid var(--border);
    transition: background 0.3s, border-color 0.3s;
}

[data-theme="dark"] .navbar {
    background: rgba(17, 17, 24, 0.85);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.nav-brand-icon {
    background: var(--primary-light);
    color: var(--primary);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
}

.nav-brand span {
    color: var(--primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: color 0.2s, background 0.2s;
}

.nav-link:hover {
    color: var(--text-main);
    background: var(--surface-variant);
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
    text-decoration: none;
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(107, 78, 255, 0.35);
    background: var(--primary-dark);
    color: white;
}

.btn-cta-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary-light);
}

.btn-cta-outline:hover {
    background: var(--primary-light);
    color: var(--primary);
    box-shadow: none;
    transform: none;
}

.btn-cta-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.theme-toggle-nav {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    transition: color 0.2s, background 0.2s;
}

.theme-toggle-nav:hover {
    background: var(--surface-variant);
    color: var(--primary);
}

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 8rem 2rem 4rem;
    position: relative;
    overflow: hidden;
}

/* Animated gradient orbs behind hero */
.hero::before,
.hero::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    z-index: 0;
    animation: float 8s ease-in-out infinite;
}

.hero::before {
    width: 600px;
    height: 600px;
    background: var(--gradient-start);
    top: -200px;
    right: -100px;
}

.hero::after {
    width: 500px;
    height: 500px;
    background: var(--gradient-end);
    bottom: -150px;
    left: -100px;
    animation-delay: 4s;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-30px);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--primary-light);
    color: var(--primary);
    padding: 0.5rem 1.25rem;
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 2rem;
    animation: fadeUp 0.6s ease-out;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -1.5px;
    animation: fadeUp 0.6s ease-out 0.1s backwards;
}

.hero h1 .gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
    animation: fadeUp 0.6s ease-out 0.2s backwards;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeUp 0.6s ease-out 0.3s backwards;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- Social Proof --- */
.social-proof {
    text-align: center;
    padding: 1.5rem 2rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
}

/* --- Trust Bar --- */
.trust-bar {
    padding: 3rem 2rem;
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.trust-bar .container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.trust-icon-box {
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* --- Section Base --- */
.section {
    padding: 6rem 2rem;
}

.section-dark {
    background: var(--surface);
}

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

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-label {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary);
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* --- How It Works --- */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.step-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
}

.step-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 auto 1.5rem;
}

.step-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.step-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* --- Features Grid --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* --- FAQ Section --- */
.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    overflow: hidden;
    transition: border-color 0.2s;
}

.faq-item.active {
    border-color: var(--primary-light);
}

.faq-question {
    width: 100%;
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface);
    border: none;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    text-align: left;
    transition: background 0.2s;
}

.faq-question:hover {
    background: var(--surface-variant);
}

.faq-chevron {
    transition: transform 0.3s;
    flex-shrink: 0;
    color: var(--text-secondary);
}

.faq-item.active .faq-chevron {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer-inner {
    padding: 0 1.5rem 1.25rem;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

/* --- Final CTA --- */
.cta-section {
    padding: 6rem 2rem;
    text-align: center;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
    top: -200px;
    right: -100px;
}

.cta-section h2 {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 700;
    margin-bottom: 1rem;
    position: relative;
}

.cta-section p {
    font-size: 1.15rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    position: relative;
}

.cta-section .btn-cta {
    background: white;
    color: var(--primary);
    font-size: 1.1rem;
    padding: 1rem 2.5rem;
    position: relative;
}

.cta-section .btn-cta:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
    background: white;
}

/* --- Footer --- */
.site-footer {
    padding: 3rem 2rem;
    border-top: 1px solid var(--border);
    background: var(--surface);
}

.footer-container {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--text-main);
}

.footer-copy {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* --- Theme Toggle Visibility --- */
[data-theme="light"] .moon-icon {
    display: block;
}

[data-theme="light"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

/* --- Hamburger Menu --- */
.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 8px;
    border-radius: 50%;
    transition: color 0.2s, background 0.2s;
}

.hamburger:hover {
    background: var(--surface-variant);
    color: var(--primary);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-actions {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--surface);
        border-bottom: 1px solid var(--border);
        padding: 1rem 2rem;
        box-shadow: var(--shadow-md);
    }

    .nav-actions.open {
        display: flex;
    }

    .nav-link {
        display: block;
        padding: 0.75rem 0;
    }

    .hero {
        padding: 7rem 1.5rem 3rem;
        min-height: auto;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.05rem;
    }

    .steps-grid,
    .features-grid {
        grid-template-columns: 1fr;
    }

    .trust-bar .container {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}