/* ======================================
   BidKit Landing Page - Design System
   ====================================== */

/* ---------- CSS Variables ---------- */
:root {
    /* Colors */
    --color-navy: #1e3a5f;
    --color-navy-dark: #152a45;
    --color-orange: #f97316;
    --color-orange-light: #ffedd5;
    --color-orange-dark: #ea580c;
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    --color-success: #22c55e;

    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Container */
    --container-max: 72rem;
    --container-padding: 1rem;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-900);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ---------- Utility Classes ---------- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section-padding {
    padding: var(--spacing-20) 0;
}

.text-center {
    text-align: center;
}

.flex {
    display: flex;
}

.items-center {
    align-items: center;
}

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

.justify-between {
    justify-content: space-between;
}

.gap-2 {
    gap: var(--spacing-2);
}

.gap-4 {
    gap: var(--spacing-4);
}

.gap-8 {
    gap: var(--spacing-8);
}

.gap-12 {
    gap: var(--spacing-12);
}

.mt-4 {
    margin-top: var(--spacing-4);
}

.mt-6 {
    margin-top: var(--spacing-6);
}

.mt-8 {
    margin-top: var(--spacing-8);
}

.mt-12 {
    margin-top: var(--spacing-12);
}

.mt-16 {
    margin-top: var(--spacing-16);
}

.mb-4 {
    margin-bottom: var(--spacing-4);
}

.mb-8 {
    margin-bottom: var(--spacing-8);
}

.mb-12 {
    margin-bottom: var(--spacing-12);
}

.mb-16 {
    margin-bottom: var(--spacing-16);
}

/* ---------- Typography ---------- */
.heading-1 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.heading-2 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    line-height: 1.2;
}

.heading-3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    line-height: 1.3;
}

.overline {
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-orange);
    margin-bottom: var(--spacing-2);
}

.text-secondary {
    color: var(--color-gray-600);
}

.text-muted {
    color: var(--color-gray-500);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-orange);
    color: var(--color-white);
    box-shadow: 0 4px 14px 0 rgba(249, 115, 22, 0.4);
}

.btn-primary:hover {
    background: var(--color-orange-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(249, 115, 22, 0.5);
}

.btn-secondary {
    border: 2px solid var(--color-navy);
    color: var(--color-navy);
    background: transparent;
}

.btn-secondary:hover {
    background: var(--color-navy);
    color: var(--color-white);
}

.btn-text {
    color: var(--color-gray-600);
    padding: var(--spacing-3) var(--spacing-4);
}

.btn-text:hover {
    color: var(--color-navy);
}

.btn-large {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-lg);
}

.btn-accent {
    background: var(--color-orange);
    color: var(--color-white);
    box-shadow: 0 4px 14px 0 rgba(249, 115, 22, 0.4);
}

.btn-accent:hover {
    background: var(--color-orange-dark);
    transform: translateY(-2px);
}

/* ---------- Badges ---------- */
.badge {
    display: inline-block;
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-full);
}

.badge-orange {
    background: var(--color-orange-light);
    color: var(--color-orange-dark);
}

.badge-navy {
    background: var(--color-navy);
    color: var(--color-white);
}

/* ---------- Cards ---------- */
.card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

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

/* ---------- Icons ---------- */
.icon {
    width: 24px;
    height: 24px;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
}

.icon-lg {
    width: 48px;
    height: 48px;
}

.icon-container {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-orange-light) 0%, rgba(249, 115, 22, 0.1) 100%);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-4);
}

.icon-container .icon {
    color: var(--color-orange);
}

/* ======================================
   Section Styles
   ====================================== */

/* ---------- Navbar ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--color-white);
    transition: box-shadow var(--transition-base);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.navbar-logo {
    height: 48px;
    width: auto;
}

.navbar-links {
    display: none;
    gap: var(--spacing-8);
}

.navbar-links a {
    font-weight: 500;
    color: var(--color-gray-600);
    transition: color var(--transition-fast);
}

.navbar-links a:hover {
    color: var(--color-navy);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.navbar-actions .btn-primary {
    display: none;
}

.mobile-menu-btn {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-gray-700);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.mobile-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-white);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-slow);
}

.mobile-menu.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.mobile-menu a {
    display: block;
    padding: var(--spacing-3) 0;
    font-weight: 500;
    color: var(--color-gray-700);
    border-bottom: 1px solid var(--color-gray-100);
}

.mobile-menu .btn-primary {
    width: 100%;
    margin-top: var(--spacing-4);
    text-align: center;
    justify-content: center;
    border-bottom: none;
}

/* ---------- Hero Section ---------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-gray-50) 100%);
    overflow: hidden;
}

.hero-grid {
    display: grid;
    gap: var(--spacing-12);
    align-items: center;
}

.hero-content {
    text-align: center;
}

.hero-headline {
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    font-weight: 700;
    line-height: 1.1;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
}

.hero-subheadline {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    margin-top: var(--spacing-6);
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
    margin-top: var(--spacing-8);
}

.hero-cta .btn-primary .subtext {
    font-size: var(--font-size-xs);
    font-weight: 400;
    opacity: 0.9;
    display: block;
    margin-top: 2px;
}

.hero-social-proof {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    margin-top: var(--spacing-8);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.stars {
    display: flex;
    gap: 2px;
    color: #fbbf24;
}

.hero-media {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-8);
}

.hero-image {
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--color-gray-200);
    max-width: 100%;
}

/* ---------- Pain Points Section ---------- */
.pain-points {
    background: var(--color-gray-50);
}

.pain-grid {
    display: grid;
    gap: var(--spacing-8);
    margin-top: var(--spacing-12);
}

.pain-card {
    text-align: center;
    padding: var(--spacing-6);
}

.pain-card .icon-container {
    background: linear-gradient(135deg, #fee2e2 0%, rgba(239, 68, 68, 0.1) 100%);
    margin: 0 auto var(--spacing-4);
}

.pain-card .icon {
    color: #ef4444;
}

.pain-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.pain-card p {
    color: var(--color-gray-600);
}

/* ---------- Solution Section ---------- */
.solution {
    background: var(--color-white);
}

.solution-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-16);
}

.solution-header .subheadline {
    color: var(--color-gray-600);
    margin-top: var(--spacing-4);
}

.steps-grid {
    display: grid;
    gap: var(--spacing-8);
}

.step-card {
    text-align: center;
    padding: var(--spacing-6);
    position: relative;
}

.step-number {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: var(--color-navy);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.step-card .icon-container {
    margin: var(--spacing-8) auto var(--spacing-4);
}

.step-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.step-card p {
    color: var(--color-gray-600);
}

.step-visual {
    margin-top: var(--spacing-4);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

/* ---------- Features Section ---------- */
.features {
    background: var(--color-gray-50);
}

.features-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-16);
}

.features-grid {
    display: grid;
    gap: var(--spacing-6);
}

.feature-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    transition: all var(--transition-base);
    border: 1px solid var(--color-gray-100);
}

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

.feature-card h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
}

.feature-card p {
    color: var(--color-gray-600);
    font-size: var(--font-size-sm);
}

/* ---------- Demo Section ---------- */
.demo {
    background: var(--color-white);
}

.demo-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.demo-header .subheadline {
    color: var(--color-gray-600);
    margin-top: var(--spacing-4);
}

.demo-video {
    margin-top: var(--spacing-12);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-2xl);
    aspect-ratio: 16 / 9;
    background: var(--color-gray-900);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.demo-video img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.play-button {
    position: absolute;
    width: 80px;
    height: 80px;
    background: var(--color-orange);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 20px rgba(249, 115, 22, 0.5);
}

.play-button:hover {
    transform: scale(1.1);
}

.play-button svg {
    width: 32px;
    height: 32px;
    margin-left: 4px;
}

.demo-cta {
    text-align: center;
    margin-top: var(--spacing-8);
}

/* ---------- Pricing Section ---------- */
.pricing {
    background: var(--color-gray-50);
}

.pricing-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.pricing-header .subheadline {
    color: var(--color-gray-600);
    margin-top: var(--spacing-4);
}

.pricing-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-4);
    margin-top: var(--spacing-8);
}

.pricing-toggle button {
    padding: var(--spacing-2) var(--spacing-4);
    font-weight: 500;
    color: var(--color-gray-500);
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
}

.pricing-toggle button.active {
    background: var(--color-white);
    color: var(--color-navy);
    box-shadow: var(--shadow-sm);
}

.pricing-grid {
    display: grid;
    gap: var(--spacing-6);
    margin-top: var(--spacing-12);
}

.pricing-card {
    background: var(--color-white);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    border: 2px solid var(--color-gray-100);
    transition: all var(--transition-base);
    position: relative;
}

.pricing-card.highlighted {
    border-color: var(--color-orange);
    transform: scale(1.02);
}

.pricing-card .popular-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
}

.pricing-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
}

.pricing-price {
    margin-top: var(--spacing-4);
}

.pricing-price .amount {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-gray-900);
}

.pricing-price .period {
    color: var(--color-gray-500);
}

.pricing-description {
    color: var(--color-gray-600);
    margin-top: var(--spacing-2);
    font-size: var(--font-size-sm);
}

.pricing-features {
    margin-top: var(--spacing-6);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
}

.pricing-features li.included .icon {
    color: var(--color-success);
}

.pricing-features li.not-included {
    color: var(--color-gray-400);
}

.pricing-features li.not-included .icon {
    color: var(--color-gray-300);
}

.pricing-card .btn {
    width: 100%;
    margin-top: var(--spacing-8);
}

.pricing-note {
    text-align: center;
    margin-top: var(--spacing-8);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

/* ---------- FAQ Section ---------- */
.faq {
    background: var(--color-white);
}

.faq-header {
    text-align: center;
    margin-bottom: var(--spacing-12);
}

.faq-list {
    max-width: 48rem;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--color-gray-200);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-5) 0;
    font-weight: 600;
    font-size: var(--font-size-lg);
    text-align: left;
    color: var(--color-gray-900);
    transition: color var(--transition-fast);
}

.faq-question:hover {
    color: var(--color-orange);
}

.faq-question .icon {
    transition: transform var(--transition-base);
    flex-shrink: 0;
    margin-left: var(--spacing-4);
}

.faq-item.open .faq-question .icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.faq-answer-inner {
    padding-bottom: var(--spacing-5);
    color: var(--color-gray-600);
    line-height: 1.7;
}

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

/* ---------- Final CTA Section ---------- */
.final-cta {
    background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-dark) 100%);
    color: var(--color-white);
}

.final-cta-content {
    text-align: center;
    max-width: 48rem;
    margin: 0 auto;
}

.final-cta h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
}

.final-cta .subheadline {
    color: rgba(255, 255, 255, 0.7);
    margin-top: var(--spacing-4);
    font-size: var(--font-size-xl);
}

.final-cta .btn {
    margin-top: var(--spacing-8);
}

.final-cta .reassurance {
    margin-top: var(--spacing-4);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

/* ---------- Footer ---------- */
.footer {
    background: var(--color-gray-900);
    color: var(--color-gray-400);
    padding: var(--spacing-12) 0;
}

.footer-grid {
    display: grid;
    gap: var(--spacing-8);
}

.footer-brand .logo {
    height: 56px;
    margin-bottom: var(--spacing-4);
    filter: brightness(1.5) saturate(1.2);
}

.footer-brand p {
    font-size: var(--font-size-sm);
}

.footer-column h4 {
    color: var(--color-white);
    font-weight: 600;
    margin-bottom: var(--spacing-4);
}

.footer-column a {
    display: block;
    font-size: var(--font-size-sm);
    padding: var(--spacing-1) 0;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-white);
}

.footer-bottom {
    margin-top: var(--spacing-12);
    padding-top: var(--spacing-8);
    border-top: 1px solid var(--color-gray-800);
    text-align: center;
    font-size: var(--font-size-sm);
}

/* ======================================
   Responsive Styles
   ====================================== */

@media (min-width: 640px) {
    :root {
        --container-padding: 1.5rem;
    }

    .hero-cta {
        flex-direction: row;
        justify-content: center;
    }

    .pain-grid,
    .steps-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

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

@media (min-width: 768px) {
    .navbar-links {
        display: flex;
    }

    .navbar-actions .btn-primary {
        display: inline-flex;
    }

    .mobile-menu-btn {
        display: none;
    }

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

    .hero-content {
        text-align: left;
    }

    .hero-subheadline {
        margin-left: 0;
        margin-right: 0;
    }

    .hero-cta {
        justify-content: flex-start;
    }

    .hero-social-proof {
        justify-content: flex-start;
    }

    .hero-media {
        margin-top: 0;
    }

    .heading-1 {
        font-size: var(--font-size-5xl);
    }

    .pricing-grid {
        grid-template-columns: repeat(3, 1fr);
        align-items: center;
    }

    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

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

/* ======================================
   Animations
   ====================================== */

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

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

.animate-fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.delay-100 {
    animation-delay: 100ms;
}

.delay-200 {
    animation-delay: 200ms;
}

.delay-300 {
    animation-delay: 300ms;
}

.delay-400 {
    animation-delay: 400ms;
}

/* Scroll reveal - initial state */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}