/* ===== CSS Variables ===== */
:root {
    --color-primary: #0098EA;
    --color-primary-hover: #007bc7;
    --color-primary-light: #e8f4fc;
    
    --color-bg-white: #ffffff;
    --color-bg-gray: #f7f9fb;
    
    --color-text: #1a1a1a;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    
    --color-border: #e5e7eb;
    
    --color-success: #10b981;
    --color-error: #ef4444;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
    
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-full: 9999px;
    
    --transition: 200ms ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg-white);
}

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

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

/* ===== Utilities ===== */
.text-primary {
    color: var(--color-primary);
}

.text-primary-light {
    color: #4dc4ff;
}

.text-bold {
    font-weight: 600;
}

/* ===== Layout ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ===== Navigation ===== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-sm) 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.nav-links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition);
}

.nav-links a:hover {
    color: var(--color-primary);
}

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

.lang-dropdown {
    position: relative;
}

.lang-current {
    display: flex;
    align-items: center;
    gap: 6px;
    background: none;
    border: none;
    font-family: var(--font-family);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.lang-current:hover {
    color: var(--color-text);
}

.lang-icon {
    width: 18px;
    height: 18px;
}

.lang-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    min-width: 140px;
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.25s ease;
}

.lang-dropdown:hover .lang-menu,
.lang-dropdown.open .lang-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    width: 100%;
    background: none;
    border: none;
    font-family: var(--font-family);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    text-align: left;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}

.lang-option:hover {
    background: var(--color-bg-gray);
    color: var(--color-text);
}

.lang-option.active {
    color: var(--color-primary);
}

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

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 0.875rem 2rem;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

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

.btn-dark {
    background: var(--color-text);
    color: white;
}

.btn-dark:hover {
    background: #333;
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.0625rem;
}

/* ===== Section Titles ===== */
.section-title-left {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
    margin-bottom: var(--space-xl);
}

/* ===== Hero Section ===== */
.hero {
    padding-top: 160px;
    padding-bottom: var(--space-2xl);
    background: var(--color-bg-white);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    will-change: transform, opacity;
}

.hero-title {
    font-size: clamp(3.5rem, 10vw, 5.5rem);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-lg);
    color: var(--color-text);
}

@media (max-width: 1200px) {
    .hero-title {
        font-size: clamp(2.25rem, 8vw, 3rem);
    }
}

.hero-with {
    display: none;
}

.hero-with-gradient::after {
    content: ' ';
}

.hero-gradient {
    display: block;
    font-size: 1.1em;
    line-height: 1.2;
    padding-bottom: 0.1em;
    background: linear-gradient(90deg, #0098EA 0%, #00D1FF 50%, #0098EA 100%);
    background-size: 200% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease-in-out infinite;
}

/* Mobile: "Split expenses with" on first line, dynamic word on second */
@media (max-width: 1200px) {
    .hero-with {
        display: inline !important;
    }
    
    .hero-with::before {
        content: ' ';
    }
    
    .hero-break {
        display: none !important;
    }
    
    .hero-with-gradient {
        display: none !important;
    }
    
    .hero-gradient {
        display: block;
        margin-top: 0.1em;
        min-height: 1.5em; /* Reserve space for dynamic word to prevent jumping */
    }
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.typing-text::after {
    content: '|';
    position: absolute;
    -webkit-text-fill-color: var(--color-primary);
    font-weight: 400;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.hero-subtitle {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.6;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===== Getting Started Section ===== */
.getting-started {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-gray);
    position: relative;
    z-index: 2;
}

.getting-started .section-title-left {
    margin-bottom: var(--space-xl);
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    max-width: 1200px;
    margin: 0 auto;
}

@media (max-width: 1000px) {
    .showcase-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 600px;
    }
}

@media (max-width: 600px) {
    .showcase-grid {
        grid-template-columns: 1fr;
        max-width: 320px;
    }
}

.showcase-card {
    border-radius: var(--radius-xl);
    padding: var(--space-md);
    padding-bottom: 0;
    display: flex;
    flex-direction: column;
    min-height: 480px;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.showcase-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.showcase-card-blue {
    background: linear-gradient(180deg, #4dc4ff 0%, #0098EA 100%);
    color: white;
}

.showcase-card-light {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    padding-top: 0;
    padding-bottom: var(--space-lg);
}

.showcase-card-dark {
    background: linear-gradient(180deg, #2d3748 0%, #1a202c 100%);
    color: white;
}

.showcase-text {
    font-size: 1.125rem;
    font-weight: 500;
    line-height: 1.4;
    padding: var(--space-xs) 0;
}

.showcase-text-light {
    color: rgba(255, 255, 255, 0.95);
}

/* Phone Mockup */
.phone-mockup {
    flex: 1;
    display: flex;
    justify-content: center;
    position: relative;
}

.phone-mockup-bottom {
    align-items: flex-end;
    margin-top: var(--space-md);
}

.phone-mockup-top {
    align-items: flex-start;
    margin-bottom: var(--space-md);
}

.phone-frame {
    position: relative;
    width: 92%;
    background: #1a1a1a;
    border-radius: 40px;
    padding: 10px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.phone-mockup-bottom .phone-frame {
    margin-bottom: -100px;
}

.phone-mockup-top .phone-frame {
    margin-top: -100px;
}

.phone-screen {
    background: white;
    border-radius: 30px;
    overflow: hidden;
}

.phone-notch {
    display: none;
}

.phone-screen img {
    width: 100%;
    height: auto;
    display: block;
}

/* ===== Features Section ===== */
.features {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

@media (max-width: 900px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    padding: var(--space-lg);
    background: var(--color-bg-gray);
    border-radius: var(--radius-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.5s ease;
}

.feature-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.06);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin-bottom: var(--space-md);
}

.feature-icon svg {
    width: 36px;
    height: 36px;
    color: var(--color-primary);
}

.feature-card h3 {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
    color: var(--color-text);
}

.feature-card p {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* ===== FAQ Section ===== */
.faq {
    padding: var(--space-2xl) 0;
    background: var(--color-bg-white);
}

.faq-layout {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-2xl);
    align-items: start;
}

@media (max-width: 900px) {
    .faq-layout {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
}

.faq-title {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
    position: sticky;
    top: 100px;
    margin-top: 0.5rem;
}

@media (max-width: 900px) {
    .faq-title {
        position: static;
    }
}

.faq-list {
    display: flex;
    flex-direction: column;
}

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

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    background: none;
    border: none;
    font-family: var(--font-family);
    font-size: 1.25rem;
    font-weight: 600;
    text-align: left;
    color: var(--color-text);
    cursor: pointer;
    transition: color var(--transition);
}

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

.faq-icon {
    width: 24px;
    height: 24px;
    position: relative;
    flex-shrink: 0;
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background: var(--color-primary);
    border-radius: 1px;
    transition: all 0.3s ease;
}

.faq-icon::before {
    width: 16px;
    height: 2px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.faq-icon::after {
    width: 2px;
    height: 16px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.faq-item.open .faq-icon::after {
    transform: translate(-50%, -50%) rotate(90deg);
    opacity: 0;
}

.faq-item.open .faq-question {
    color: var(--color-primary);
}

.faq-answer {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.3s ease, opacity 0.3s ease;
    opacity: 0;
}

.faq-item.open .faq-answer {
    grid-template-rows: 1fr;
    opacity: 1;
}

.faq-answer-inner {
    overflow: hidden;
    padding-bottom: 0;
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--color-text-secondary);
    transition: padding 0.3s ease;
}

.faq-item.open .faq-answer-inner {
    padding-bottom: var(--space-lg);
}

.faq-learn-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: var(--space-lg);
    padding: var(--space-sm) 0;
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
    transition: all var(--transition);
}

.faq-learn-more:hover {
    gap: 10px;
}

.faq-learn-more svg {
    width: 20px;
    height: 20px;
    transition: transform var(--transition);
}

.faq-learn-more:hover svg {
    transform: translateX(4px);
}

/* ===== FAQ Page ===== */
.faq-page {
    padding: calc(80px + var(--space-xl)) 0 var(--space-2xl);
    min-height: calc(100vh - 200px);
}

.faq-page-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-xs);
}

.faq-page-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2xl);
}

.faq-section {
    margin-bottom: var(--space-xl);
}

.faq-section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
}

.faq-support {
    margin-top: var(--space-2xl);
    padding: var(--space-xl);
    background: linear-gradient(135deg, var(--color-primary) 0%, #1a73e8 100%);
    border-radius: var(--radius-lg);
    text-align: center;
}

.faq-support-content h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    color: white;
    margin-bottom: var(--space-xs);
}

.faq-support-content p {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-lg);
}

.faq-support .btn-primary {
    background: white;
    color: var(--color-primary);
}

.faq-support .btn-primary:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
}

/* ===== Footer ===== */
.footer {
    padding: var(--space-lg) 0 var(--space-lg);
    background: var(--color-bg-gray);
    border-top: 1px solid var(--color-border);
}

.footer-main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    transition: color var(--transition);
}

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

/* ===== Legal Pages ===== */
.legal {
    max-width: 800px;
    margin: 140px auto var(--space-2xl);
    padding: 0 var(--space-md);
}

.legal-section + .legal-section {
    margin-top: var(--space-xl);
}

.legal h1 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.legal h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.legal h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-top: var(--space-md);
    margin-bottom: var(--space-xs);
}

.legal p {
    font-size: 0.9875rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.legal ul {
    padding-left: 1.25rem;
    margin: 0 0 var(--space-sm);
    color: var(--color-text-secondary);
    font-size: 0.9875rem;
}

.legal code {
    font-family: Menlo, Monaco, Consolas, "Courier New", monospace;
    font-size: 0.875rem;
    background: var(--color-bg-gray);
    padding: 0.1rem 0.25rem;
    border-radius: 4px;
}

@media (max-width: 600px) {
    .footer-main {
        flex-direction: column;
        text-align: center;
    }

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

/* ===== Feature Spotlight Sections ===== */
.feature-spotlight {
    padding: var(--space-2xl) 0;
}

.feature-spotlight-gray {
    background: var(--color-bg-gray);
}

.feature-spotlight-dark {
    background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
}

.feature-spotlight-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

@media (max-width: 900px) {
    .feature-spotlight-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .feature-spotlight-grid-reverse .feature-spotlight-visual {
        order: 2;
    }
}

.feature-spotlight-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.feature-spotlight-gray .feature-spotlight-title {
    color: var(--color-text);
}

.feature-spotlight-dark .feature-spotlight-title {
    color: white;
}

.feature-spotlight-desc {
    font-size: 1.125rem;
    line-height: 1.7;
    max-width: 480px;
}

.feature-spotlight-gray .feature-spotlight-desc {
    color: var(--color-text-secondary);
}

.feature-spotlight-dark .feature-spotlight-desc {
    color: rgba(255, 255, 255, 0.65);
}

.feature-spotlight-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* ===== Spotlight Phone Mockup ===== */
.spotlight-phone {
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.spotlight-phone.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.spotlight-phone .phone-frame {
    width: 260px;
    box-shadow: 0 32px 80px rgba(0, 0, 0, 0.25);
}

.feature-spotlight-dark .spotlight-phone .phone-frame {
    box-shadow: 0 32px 80px rgba(0, 152, 234, 0.2), 0 0 0 1px rgba(255, 255, 255, 0.06);
}

@media (max-width: 900px) {
    .spotlight-phone .phone-frame {
        width: 200px;
    }
}