/* ========================================
   MarineAndErwan Birthday Website
   Main Stylesheet - Shared Styles & Theme
   ======================================== */

/* CSS Variables - Light Pastel Birthday Theme */
:root {
    /* Pastel Color Palette */
    --pastel-blue: #b8e0ea;
    --pastel-aqua: #aee6e6;
    --pastel-pink: #f7d6e0;
    --pastel-peach: #ffe5d0;
    --pastel-lavender: #e6e6fa;
    --pastel-yellow: #fff7d6;
    --pastel-mint: #d6f5e6;
    --pastel-coral: #ffd6d6;
    --pastel-sand: #f9f6f2;
    --pastel-rose: #f8e1f4;

    /* Primary Theme Colors */
    --primary-color: var(--pastel-pink);
    --secondary-color: var(--pastel-blue);
    --accent-color: var(--pastel-lavender);
    --background-color: var(--pastel-sand);
    --text-dark: #4a4a4a;
    --text-light: #6b6b6b;
    --white: #ffffff;

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

    /* Typography */
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-heading: 'Georgia', 'Times New Roman', serif;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 50%;

    /* 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: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ========================================
   Reset & Base Styles
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--background-color);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text-dark);
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 600;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
}

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

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

/* ========================================
   Layout Utilities
   ======================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

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

/* ========================================
   Navigation
   ======================================== */

.nav-header {
    background: linear-gradient(135deg, var(--pastel-pink) 0%, var(--pastel-lavender) 100%);
    padding: var(--spacing-sm) 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

.nav-links a {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    font-weight: 500;
}

.nav-links a:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* ========================================
   Buttons
   ======================================== */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    font-size: 1rem;
    font-family: var(--font-primary);
}

.btn-primary {
    background: linear-gradient(135deg, var(--pastel-pink) 0%, var(--pastel-coral) 100%);
    color: var(--text-dark);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: linear-gradient(135deg, var(--pastel-blue) 0%, var(--pastel-aqua) 100%);
    color: var(--text-dark);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   Cards
   ======================================== */

.card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   Images
   ======================================== */

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

.img-rounded {
    border-radius: var(--radius-md);
}

.img-circle {
    border-radius: var(--radius-full);
}

/* ========================================
   Loading & Animations
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.fade-in {
    animation: fadeIn var(--transition-slow) ease-out;
}

.slide-in {
    animation: slideIn var(--transition-slow) ease-out;
}

.scale-in {
    animation: scaleIn var(--transition-slow) ease-out;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background: linear-gradient(135deg, var(--pastel-lavender) 0%, var(--pastel-blue) 100%);
    padding: var(--spacing-lg) 0;
    text-align: center;
    margin-top: var(--spacing-xl);
}

.footer-content {
    color: var(--text-dark);
}

.footer-heart {
    color: var(--pastel-coral);
    font-size: 1.2rem;
    display: inline-block;
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* ========================================
   Responsive Design
   ======================================== */

/* Tablet */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
    }

    .nav-links {
        gap: var(--spacing-sm);
    }

    .nav-links a {
        font-size: 0.9rem;
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
    }

    .nav-container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

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

/* ========================================
   Accessibility
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
.btn:focus {
    outline: 3px solid var(--pastel-blue);
    outline-offset: 2px;
}