/* ==========================================================================
   TripPing Landing Page - Apple-style Design
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-bg: #ffffff;
    --color-bg-secondary: #f5f5f7;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-accent: #0071e3;
    --color-accent-hover: #0077ed;
    --color-border: #d2d2d7;

    /* Notification colors */
    --color-history: #5856d6;
    --color-location: #ff9500;

    /* Typography */
    --font-family: 'Pretendard Variable', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;

    /* Spacing */
    --section-padding: clamp(80px, 12vw, 140px);
    --container-max: 1200px;
    --container-padding: 24px;

    /* Animation */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.4s ease;
    --transition-slow: 0.8s ease;
}

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

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

body {
    font-family: var(--font-family);
    font-size: 17px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
}

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

a:hover {
    color: var(--color-accent-hover);
}

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

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

section {
    padding: var(--section-padding) 0;
}

/* --------------------------------------------------------------------------
   Animations
   -------------------------------------------------------------------------- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: inline-flex;
    align-items: center;
}

.logo img {
    height: 28px;
    width: auto;
}

.logo:hover {
    opacity: 0.8;
}

.nav-download {
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    background: var(--color-accent);
    color: #fff;
    border-radius: 20px;
    transition: background var(--transition-fast);
}

.nav-download:hover {
    background: var(--color-accent-hover);
    color: #fff;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* --------------------------------------------------------------------------
   Language Selector
   -------------------------------------------------------------------------- */
.lang-selector {
    position: relative;
}

.lang-current {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-size: 13px;
    color: var(--color-text);
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.lang-current:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-text-secondary);
}

.lang-flag {
    font-size: 16px;
    line-height: 1;
}

.lang-code {
    font-weight: 500;
    font-size: 12px;
}

.lang-arrow {
    width: 14px;
    height: 14px;
    opacity: 0.5;
    transition: transform var(--transition-fast);
}

.lang-selector.open .lang-arrow {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 160px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
    z-index: 1001;
}

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

.lang-dropdown button {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 10px 12px;
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-size: 14px;
    color: var(--color-text);
    text-align: left;
    transition: background var(--transition-fast);
}

.lang-dropdown button:hover {
    background: var(--color-bg-secondary);
}

.lang-dropdown button.active {
    background: var(--color-bg-secondary);
    font-weight: 500;
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px var(--container-padding) 80px;
    background: linear-gradient(180deg, #fbfbfd 0%, #ffffff 100%);
}

.hero-content {
    max-width: 700px;
}

.hero-title {
    font-size: clamp(40px, 8vw, 72px);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: clamp(18px, 3vw, 24px);
    color: var(--color-text-secondary);
    line-height: 1.4;
    margin-bottom: 40px;
}

.hero-image {
    margin-top: 60px;
}

/* Phone Mockup */
.phone-mockup {
    width: 280px;
    height: 570px;
    background: #1d1d1f;
    border-radius: 44px;
    padding: 14px;
    box-shadow:
        0 50px 100px -20px rgba(0, 0, 0, 0.25),
        0 30px 60px -30px rgba(0, 0, 0, 0.3);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: #f5f5f7;
    border-radius: 32px;
    overflow: hidden;
}

.placeholder-screen {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    font-size: 14px;
}

.phone-screen-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
}

/* Store Buttons */
.store-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* App Store Button */
.app-store-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: #000;
    color: #fff;
    border-radius: 12px;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.app-store-button:hover {
    color: #fff;
    transform: scale(1.02);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.app-store-button.large {
    padding: 16px 32px;
}

/* Google Play Button */
.google-play-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: #000;
    color: #fff;
    border-radius: 12px;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.google-play-button.large {
    padding: 16px 32px;
}

.google-play-button.coming-soon {
    background: #3c3c3e;
    cursor: default;
    opacity: 0.85;
}

.play-icon {
    width: 24px;
    height: 24px;
}

.apple-icon {
    width: 28px;
    height: 28px;
}

.button-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.button-small {
    font-size: 10px;
    opacity: 0.8;
}

.button-large {
    font-size: 18px;
    font-weight: 600;
    line-height: 1.2;
}

/* --------------------------------------------------------------------------
   Section Titles
   -------------------------------------------------------------------------- */
.section-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    text-align: center;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.section-subtitle {
    font-size: clamp(18px, 2.5vw, 21px);
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: 60px;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-top: 60px;
}

.feature-card {
    text-align: center;
    padding: 32px 24px;
}

.feature-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    color: var(--color-accent);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-title {
    font-size: 21px;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.feature-desc {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* --------------------------------------------------------------------------
   Notifications Section
   -------------------------------------------------------------------------- */
.notifications {
    background: var(--color-bg-secondary);
}

.notifications-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.notification-card {
    background: var(--color-bg);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

.notification-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.notification-icon-wrapper {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.notification-icon-wrapper.history {
    background: rgba(88, 86, 214, 0.1);
    color: var(--color-history);
}

.notification-icon-wrapper.location {
    background: rgba(255, 149, 0, 0.1);
    color: var(--color-location);
}

.notification-icon-wrapper svg {
    width: 24px;
    height: 24px;
}

.notification-header h3 {
    font-size: 21px;
    font-weight: 600;
}

.notification-desc {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

/* Notification Preview */
.notification-preview {
    background: var(--color-bg-secondary);
    border-radius: 16px;
    padding: 16px;
}

.preview-notification {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.preview-app-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    flex-shrink: 0;
    object-fit: cover;
}

.preview-content {
    flex: 1;
    min-width: 0;
}

.preview-title {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 2px;
}

.preview-body {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.4;
}

.preview-time {
    font-size: 12px;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   Screenshots Section
   -------------------------------------------------------------------------- */
.screenshots {
    background: var(--color-bg);
    overflow: hidden;
}

.screenshots-carousel {
    margin-top: 60px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.screenshots-carousel::-webkit-scrollbar {
    display: none;
}

.screenshots-track {
    display: flex;
    justify-content: center;
    gap: 24px;
    padding: 0 var(--container-padding);
}

.screenshot-item {
    flex-shrink: 0;
    width: 200px;
    height: 433px;
    background: #1d1d1f;
    border-radius: 28px;
    padding: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.screenshot-placeholder {
    width: 100%;
    height: 100%;
    background: var(--color-bg-secondary);
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--color-text-secondary);
}

.screenshot-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 22px;
}

/* --------------------------------------------------------------------------
   Languages Section
   -------------------------------------------------------------------------- */
.languages {
    background: var(--color-bg-secondary);
}

.languages-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-top: 40px;
}

.language-badge {
    padding: 12px 24px;
    background: var(--color-bg);
    border-radius: 100px;
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

/* --------------------------------------------------------------------------
   CTA Section
   -------------------------------------------------------------------------- */
.cta {
    background: var(--color-bg);
    text-align: center;
    padding: var(--section-padding) var(--container-padding);
}

.cta-title {
    font-size: clamp(36px, 6vw, 56px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.cta-subtitle {
    font-size: clamp(18px, 2.5vw, 21px);
    color: var(--color-text-secondary);
    margin-bottom: 40px;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
    background: var(--color-bg-secondary);
    padding: 48px 0;
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo img {
    height: 24px;
    width: auto;
}

.footer-copyright {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 12px;
}

.footer-links {
    display: flex;
    gap: 80px;
}

.footer-column h4 {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 16px;
}

.footer-column a {
    display: block;
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

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

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

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

/* Mobile */
@media (max-width: 767px) {
    :root {
        --container-padding: 20px;
    }

    .nav-right {
        gap: 12px;
    }

    .lang-code {
        display: none;
    }

    .lang-current {
        padding: 6px 8px;
    }

    .lang-arrow {
        width: 12px;
        height: 12px;
    }

    .nav-download {
        font-size: 13px;
        padding: 6px 12px;
    }

    .lang-dropdown {
        right: -50%;
    }

    .hero {
        min-height: auto;
        padding: 100px 20px 60px;
    }

    .hero-title br {
        display: none;
    }

    .hero-subtitle br {
        display: none;
    }

    .phone-mockup {
        width: 220px;
        height: 448px;
        border-radius: 36px;
        padding: 10px;
    }

    .phone-screen {
        border-radius: 26px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .feature-card {
        display: flex;
        text-align: left;
        gap: 20px;
        padding: 24px;
        background: var(--color-bg-secondary);
        border-radius: 16px;
    }

    .feature-icon {
        width: 48px;
        height: 48px;
        margin: 0;
        flex-shrink: 0;
    }

    .feature-content {
        flex: 1;
    }

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

    .notification-card {
        padding: 28px;
    }

    .screenshots-track {
        padding: 0 20px;
    }

    .screenshot-item {
        width: 160px;
        height: 347px;
        border-radius: 24px;
    }

    .screenshot-placeholder {
        border-radius: 18px;
    }

    .screenshot-img {
        border-radius: 18px;
    }

    .footer-content {
        flex-direction: column;
        gap: 40px;
    }

    .footer-links {
        gap: 48px;
    }
}

/* Small Mobile */
@media (max-width: 375px) {
    .hero-title {
        font-size: 36px;
    }

    .section-title {
        font-size: 28px;
    }

    .app-store-button {
        padding: 10px 20px;
    }

    .button-large {
        font-size: 16px;
    }
}