/* ========================================
   Deer Santa Landing Page Styles
   Modern Minimal Design with Brand Colors
   ======================================== */

/* === CSS Variables === */
:root {
    /* Brand Colors from iOS App */
    --primary-bg: #F5F5F7;
    --dark-bg: #121212;
    --card-bg: #1E1E1E;
    --surface-bg: #2A2A2A;

    --primary-accent: #007AFF;
    --secondary-accent: #00C2A8;

    --primary-text: #1E1E1E;
    --secondary-text: #707070;
    --light-text: #FFFFFF;

    --christmas-red: #DC143C;
    --christmas-green: #228B22;
    --christmas-gold: #FFD700;
    --festive-orange: #FF6B35;

    --border-subtle: #E5E5E7;
    --border-medium: #D1D1D6;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    --spacing-xxxl: 6rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--primary-text);
    background-color: var(--primary-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

/* === Container === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* === Navigation === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 var(--border-subtle);
    z-index: 1000;
    transition: background var(--transition-base);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    font-size: 1.25rem;
    z-index: 1001;
}

.nav-logo a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: inherit;
    text-decoration: none;
}

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
}

.logo-text {
    color: var(--primary-text);
}

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

.nav-link {
    color: var(--secondary-text);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-accent);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
    transition: transform var(--transition-base);
}

.mobile-menu-toggle:hover {
    transform: scale(1.1);
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--primary-text);
    transition: all var(--transition-base);
    border-radius: 2px;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
}

.btn-primary {
    background: var(--primary-accent);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: #0051D5;
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

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

/* === Hero Section === */
.hero {
    padding: calc(80px + var(--spacing-xxxl)) 0 var(--spacing-xxxl);
    background: linear-gradient(180deg, #F5F5F7 0%, #FFFFFF 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.hero-text {
    max-width: 600px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    color: var(--primary-text);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    color: var(--secondary-text);
    margin-bottom: var(--spacing-xl);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.hero-note {
    font-size: 0.875rem;
    color: var(--secondary-text);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-character {
    max-width: 400px;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-20px);
    }
}

/* === Section Titles === */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--primary-text);
    letter-spacing: -0.02em;
}

/* === Features Section === */
.features {
    padding: var(--spacing-xxxl) 0;
    background: white;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xxl);
}

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

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

.feature-icon {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-text);
}

.feature-description {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--secondary-text);
}

/* === Screenshots Section === */
.screenshots {
    padding: var(--spacing-xxxl) 0;
    background: var(--primary-bg);
}

.screenshots-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xxl);
}

.screenshot-placeholder {
    aspect-ratio: 9 / 19.5;
    background: white;
    border: 2px dashed var(--border-medium);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.screenshot-placeholder:hover {
    border-color: var(--primary-accent);
    box-shadow: var(--shadow-md);
}

.placeholder-content {
    text-align: center;
    color: var(--secondary-text);
}

.placeholder-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-sm);
    opacity: 0.5;
}

.placeholder-content p {
    font-size: 0.875rem;
    font-weight: 500;
}

.screenshot-item {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-sm);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.screenshot-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.screenshot-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    display: block;
}

/* === Download Section === */
.download {
    padding: var(--spacing-xxxl) 0;
    background: linear-gradient(135deg, var(--primary-accent) 0%, var(--secondary-accent) 100%);
    position: relative;
    overflow: hidden;
}

.download-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.download-character {
    width: 150px;
    margin: 0 auto var(--spacing-lg);
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.2));
}

.download-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.download-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.download .btn-primary:hover {
    background: var(--primary-bg);
    transform: translateY(-4px);
}

/* === Contact Section === */
.contact {
    padding: var(--spacing-xxxl) 0;
    background: white;
}

.contact-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--secondary-text);
    margin-bottom: var(--spacing-xxl);
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-text);
    margin-bottom: var(--spacing-xs);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-medium);
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 1rem;
    color: var(--primary-text);
    background: white;
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-accent);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-feedback {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 500;
    display: none;
}

.form-feedback.success {
    display: block;
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-feedback.error {
    display: block;
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* === Footer === */
.footer {
    background: var(--dark-bg);
    color: var(--light-text);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--surface-bg);
    margin-bottom: var(--spacing-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.footer-logo-img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
}

.footer-logo-text {
    font-size: 1.25rem;
    font-weight: 600;
}

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

.footer-link {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: white;
}

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

.footer-text {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: var(--spacing-xs);
}

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

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

@media (max-width: 768px) {
    /* Mobile Navigation */
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 280px;
        background: white;
        flex-direction: column;
        padding: 80px 30px 30px;
        gap: var(--spacing-md);
        box-shadow: -2px 0 20px rgba(0, 0, 0, 0.1);
        transition: right var(--transition-slow);
        z-index: 1000;
    }

    .nav-links.mobile-active {
        right: 0;
    }

    .nav-link {
        font-size: 1.125rem;
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--border-subtle);
        width: 100%;
    }

    .nav-links .btn {
        width: 100%;
        margin-top: var(--spacing-md);
    }

    .hero {
        padding-top: calc(80px + var(--spacing-xl));
    }

    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .hero-image {
        order: -1;
    }

    .hero-character {
        max-width: 250px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .screenshots-container {
        grid-template-columns: 1fr;
    }

    .download-title {
        font-size: 2rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn-large {
        width: 100%;
        padding: var(--spacing-md);
    }

    .section-title {
        font-size: 1.75rem;
    }

    .download-title {
        font-size: 1.75rem;
    }
}

/* === Utility Classes === */
.text-center {
    text-align: center;
}

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

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