/* ============================================
   MyTaxBuddy — Stylesheet
   ============================================ */

/* ---------- Variables ---------- */
:root {
    --navy: #0f1a2e;
    --navy-light: #1a2742;
    --navy-mid: #152035;
    --blue: #3b82f6;
    --blue-dark: #2563eb;
    --green: #4cc425;
    --green-dark: #3da31e;
    --cyan: #5ce1e6;
    --white: #ffffff;
    --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;
    --radius: 12px;
    --radius-lg: 20px;
    --radius-sm: 8px;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 20px 40px -12px rgba(0,0,0,0.25);
    --shadow-glow: 0 0 40px rgba(59,130,246,0.15);
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--gray-800);
    line-height: 1.6;
    background: var(--white);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
}

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

/* ---------- Container ---------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); }
h3 { font-size: 1.25rem; }

.gradient-text {
    background: linear-gradient(135deg, var(--blue), var(--cyan), var(--green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header p {
    color: var(--gray-500);
    font-size: 1.125rem;
    margin-top: 12px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--blue), var(--blue-dark));
    color: var(--white);
    border-color: var(--blue);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59,130,246,0.4);
}

.btn-outline {
    background: transparent;
    color: var(--blue);
    border-color: var(--blue);
}

.btn-outline:hover {
    background: var(--blue);
    color: var(--white);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.1rem;
    border-radius: var(--radius);
}

.btn-block {
    width: 100%;
    text-align: center;
}

.btn-nav {
    background: var(--blue);
    color: var(--white);
    padding: 10px 24px;
    border-radius: var(--radius-sm);
}

.btn-nav:hover {
    background: var(--blue-dark);
    transform: translateY(-1px);
}

/* ---------- Navbar ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    padding: 16px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 10px 0;
    box-shadow: var(--shadow);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--navy);
}

.nav-logo-img {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    object-fit: cover;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a:not(.btn) {
    color: var(--gray-600);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-links a:not(.btn):hover {
    color: var(--blue);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--navy);
    border-radius: 2px;
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    padding: 20px 24px;
    flex-direction: column;
    gap: 16px;
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

.mobile-menu a {
    color: var(--gray-700);
    font-weight: 500;
    font-size: 1.05rem;
    padding: 8px 0;
}

.mobile-menu a:hover {
    color: var(--blue);
}

.mobile-menu.open {
    display: flex;
}

/* ---------- Hero ---------- */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    background: rgba(59,130,246,0.08);
    color: var(--blue);
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero h1 {
    color: var(--navy);
    margin-bottom: 20px;
}

.hero-subtitle {
    color: var(--gray-500);
    font-size: 1.15rem;
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 540px;
}

.hero-ctas {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-trust {
    display: flex;
    gap: 28px;
    flex-wrap: wrap;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-500);
    font-size: 0.9rem;
    font-weight: 500;
}

.trust-icon {
    font-size: 1.1rem;
}

/* Chat Preview */
.chat-preview {
    background: var(--navy);
    border-radius: var(--radius-lg);
    padding: 0;
    overflow: hidden;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    max-width: 460px;
    margin-left: auto;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--navy-mid);
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.chat-avatar {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    object-fit: cover;
}

.chat-name {
    color: var(--white);
    font-weight: 600;
    font-size: 0.95rem;
}

.chat-status {
    color: var(--green);
    font-size: 0.75rem;
}

.chat-messages {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.chat-msg {
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 0.9rem;
    line-height: 1.6;
    max-width: 90%;
}

.chat-msg.user {
    background: var(--blue);
    color: var(--white);
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.chat-msg.bot {
    background: var(--navy-light);
    color: var(--gray-300);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.chat-msg.bot strong {
    color: var(--white);
}

/* ---------- Features ---------- */
.features {
    padding: 100px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    margin-bottom: 10px;
    color: var(--navy);
}

.feature-card p {
    color: var(--gray-500);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ---------- How It Works ---------- */
.how-it-works {
    padding: 100px 0;
    background: var(--gray-50);
}

.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 24px;
}

.step {
    text-align: center;
    max-width: 300px;
    padding: 32px 24px;
}

.step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--blue), var(--blue-dark));
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.4rem;
    margin: 0 auto 20px;
}

.step h3 {
    color: var(--navy);
    margin-bottom: 10px;
}

.step p {
    color: var(--gray-500);
    font-size: 0.95rem;
}

.step-arrow {
    font-size: 2rem;
    color: var(--gray-300);
    margin-top: 44px;
    font-weight: 300;
}

/* ---------- Billing Toggle ---------- */
.billing-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    margin-top: 24px;
    margin-bottom: 48px;
}

.toggle-label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition);
}

.toggle-label.active {
    color: var(--navy);
}

.save-badge {
    background: linear-gradient(135deg, var(--green), var(--green-dark));
    color: var(--white);
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-left: 6px;
    vertical-align: middle;
}

.toggle-switch {
    position: relative;
    width: 52px;
    height: 28px;
    cursor: pointer;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--gray-300);
    border-radius: 100px;
    transition: var(--transition);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    left: 3px;
    bottom: 3px;
    background: var(--white);
    border-radius: 50%;
    transition: var(--transition);
    box-shadow: 0 2px 4px rgba(0,0,0,0.15);
}

.toggle-switch input:checked + .toggle-slider {
    background: linear-gradient(135deg, var(--blue), var(--blue-dark));
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(24px);
}

.yearly-savings {
    color: var(--green-dark);
    font-size: 0.82rem;
    font-weight: 600;
    margin-top: -20px;
    margin-bottom: 24px;
}

/* ---------- Pricing ---------- */
.pricing {
    padding: 100px 0;
}

.credits-explainer {
    display: inline-block;
    background: rgba(59,130,246,0.08);
    color: var(--blue-dark);
    padding: 10px 20px;
    border-radius: 100px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-top: 16px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    align-items: start;
}

.pricing-card {
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.popular {
    border-color: var(--blue);
    box-shadow: var(--shadow-glow);
    transform: scale(1.02);
}

.pricing-card.popular:hover {
    transform: scale(1.02) translateY(-4px);
}

.popular-badge {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--blue), var(--blue-dark));
    color: var(--white);
    padding: 6px 20px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.pricing-tier {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.pricing-card h3 {
    font-size: 1.3rem;
    color: var(--navy);
    margin-bottom: 8px;
}

.pricing-desc {
    color: var(--gray-500);
    font-size: 0.9rem;
    margin-bottom: 24px;
    min-height: 40px;
}

.pricing-price {
    margin-bottom: 28px;
}

.price {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--navy);
}

.period {
    color: var(--gray-400);
    font-size: 1rem;
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: 28px;
}

.pricing-features li {
    padding: 8px 0;
    color: var(--gray-600);
    font-size: 0.92rem;
    border-bottom: 1px solid var(--gray-100);
}

.pricing-features li:last-child {
    border-bottom: none;
}

/* ---------- FAQ ---------- */
.faq {
    padding: 100px 0;
    background: var(--gray-50);
}

.faq-list {
    max-width: 750px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--blue);
}

.faq-question {
    width: 100%;
    padding: 20px 24px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--navy);
    text-align: left;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: inherit;
    line-height: 1.4;
}

.faq-toggle {
    font-size: 1.5rem;
    color: var(--blue);
    transition: var(--transition);
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item.open .faq-toggle {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-item.open .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 24px 20px;
    color: var(--gray-500);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ---------- CTA Section ---------- */
.cta-section {
    padding: 100px 0;
    background: var(--navy);
    text-align: center;
}

.cta-content h2 {
    color: var(--white);
    margin-bottom: 16px;
}

.cta-content p {
    color: var(--gray-400);
    font-size: 1.15rem;
    margin-bottom: 32px;
}

/* ---------- Footer ---------- */
.footer {
    background: var(--navy-mid);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--white);
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 12px;
}

.footer-logo-img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
}

.footer-brand p {
    color: var(--gray-400);
    font-size: 0.9rem;
    max-width: 280px;
}

.footer-links h4 {
    color: var(--white);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    color: var(--gray-400);
    font-size: 0.9rem;
    padding: 4px 0;
}

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

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 24px;
    text-align: center;
}

.footer-bottom p {
    color: var(--gray-500);
    font-size: 0.85rem;
}

.footer-disclaimer {
    margin-top: 8px;
    font-size: 0.8rem !important;
    color: var(--gray-600) !important;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-ctas {
        justify-content: center;
    }

    .hero-trust {
        justify-content: center;
    }

    .chat-preview {
        margin: 0 auto;
    }

    .features-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }

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

    .step-arrow {
        transform: rotate(90deg);
        margin: 0;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }

    .pricing-card.popular {
        transform: none;
    }

    .pricing-card.popular:hover {
        transform: translateY(-4px);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
}

@media (max-width: 480px) {
    .hero-ctas {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-lg {
        padding: 14px 28px;
        font-size: 1rem;
    }
}