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

:root {
    /* Color Palette - Modern, Professional but Youthful */
    --color-primary: #6366f1;      /* Indigo - main accent */
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;

    --color-bg: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-surface: #ffffff;

    --color-text: #111827;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;

    --color-border: #e5e7eb;
    --color-shadow: rgba(0, 0, 0, 0.1);

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

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;

    --line-height-tight: 1.2;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.8;

    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 1rem;
    --border-radius-sm: 0.5rem;

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

/* Dark mode support (optional - uncomment to enable) */
/*
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #111827;
        --color-bg-secondary: #1f2937;
        --color-surface: #1f2937;
        --color-text: #f9fafb;
        --color-text-secondary: #d1d5db;
        --color-text-tertiary: #9ca3af;
        --color-border: #374151;
        --color-shadow: rgba(0, 0, 0, 0.3);
    }
}
*/

html {
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    line-height: var(--line-height-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
    line-height: var(--line-height-tight);
    font-weight: 700;
    color: var(--color-text);
}

h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-xs);
}

h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

p {
    line-height: var(--line-height-relaxed);
    color: var(--color-text-secondary);
}

/* ===================================
   Container & Layout
   =================================== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===================================
   Header
   =================================== */
.header {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.logo {
    text-align: center;
}

.logo h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.tagline {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    font-weight: 400;
}

/* ===================================
   Main Content
   =================================== */
.main {
    flex: 1;
    padding: var(--spacing-2xl) 0;
}

/* Introduction Section */
.intro {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.intro h2 {
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.intro p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
}

/* ===================================
   Projects Grid
   =================================== */
.projects {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

/* Project Card */
.project-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-normal);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px var(--color-shadow);
    border-color: var(--color-primary-light);
}

.project-card:hover::before {
    transform: scaleX(1);
}

/* Card Icon */
.card-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    transition: transform var(--transition-normal);
}

.project-card:hover .card-icon {
    transform: scale(1.05) rotate(2deg);
}

.card-icon svg {
    width: 32px;
    height: 32px;
    color: white;
}

/* Card Content */
.card-content {
    flex: 1;
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: var(--font-size-xl);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.card-description {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-md);
}

/* Card Tags */
.card-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--color-bg-secondary);
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: 2rem;
    border: 1px solid var(--color-border);
}

/* Card Link/Button */
.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    background: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    transition: all var(--transition-normal);
    align-self: flex-start;
}

.card-link:hover {
    background: var(--color-primary-dark);
    transform: translateX(4px);
}

.card-link svg {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.card-link:hover svg {
    transform: translateX(4px);
}

/* Disabled state for coming soon projects */
.card-link.disabled {
    background: var(--color-bg-secondary);
    color: var(--color-text-tertiary);
    cursor: not-allowed;
    pointer-events: none;
}

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

.footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

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

.footer-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

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

/* Tablet and below */
@media (max-width: 768px) {
    :root {
        --font-size-base: 15px;
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
    }

    .header {
        padding: var(--spacing-lg) 0;
    }

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

    .intro {
        margin-bottom: var(--spacing-xl);
    }

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

/* Mobile */
@media (max-width: 480px) {
    :root {
        --font-size-base: 14px;
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .project-card {
        padding: var(--spacing-md);
    }

    .card-icon {
        width: 56px;
        height: 56px;
    }

    .card-icon svg {
        width: 28px;
        height: 28px;
    }
}

/* High resolution / Large screens */
@media (min-width: 1400px) {
    .projects {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ===================================
   Animations & Effects
   =================================== */

/* Fade in animation for page load */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.project-card {
    animation: fadeIn 0.6s ease backwards;
}

/* Stagger animation for multiple cards */
.project-card:nth-child(1) { animation-delay: 0.1s; }
.project-card:nth-child(2) { animation-delay: 0.2s; }
.project-card:nth-child(3) { animation-delay: 0.3s; }
.project-card:nth-child(4) { animation-delay: 0.4s; }
.project-card:nth-child(5) { animation-delay: 0.5s; }
.project-card:nth-child(6) { animation-delay: 0.6s; }

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===================================
   Utility Classes (optional)
   =================================== */
.text-center { text-align: center; }
.hidden { display: none; }
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}