/* ==========================================================================
   Design System & Variables
   ========================================================================== */
:root {
    /* Color Palette */
    --bg-primary: #0c0c0e;
    /* Premium deep dark background */
    --bg-secondary: #16161a;
    /* Solid card background */
    --bg-tertiary: #222227;
    /* Hover state background */
    --accent: #6366f1;
    /* Primary Accent / Button Indigo */
    --accent-light: #818cf8;
    /* Lighter Indigo for hover states */
    --accent-glow: rgba(99, 102, 241, 0.15);
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #818cf8 100%);

    /* Text Colors */
    --text-primary: #ffffff;
    /* High-contrast Text Main */
    --text-secondary: #a1a1aa;
    /* Text Muted */
    --text-muted: #71717a;
    /* Sub-labels and metadata */

    /* Borders & Spacing */
    --border-color: #27272a;
    /* Card and divider borders */
    --border-hover: #3f3f46;
    /* Hover borders */
    --border-focus: #818cf8;
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);

    /* Layout Sizes */
    --max-width: 1140px;
    --header-height: 80px;
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography Utility */
h1,
h2,
h3,
h4 {
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
    color: #ffffff;
}

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

/* ==========================================================================
   Common Components (Buttons, Badges, Layout)
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.btn-primary {
    background: var(--accent);
    color: #ffffff;
}

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

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent-light);
    background-color: rgba(99, 102, 241, 0.05);
}

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

.btn-block {
    display: flex;
    width: 100%;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    color: var(--accent-light);
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
}

.text-gradient {
    background: linear-gradient(135deg, #818cf8 0%, #c7d2fe 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ==========================================================================
   Header & Navigation (Sticky)
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(9, 9, 11, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: #ffffff;
}

.logo-accent {
    color: var(--accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a:not(.btn) {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.nav-links a:not(.btn):hover {
    color: var(--accent-light);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    position: relative;
    padding-top: calc(var(--header-height) + 4rem);
    padding-bottom: 6rem;
    min-height: 85vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-container {
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 720px;
}

.hero-headline {
    font-size: 3.5rem;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.hero-subtext {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* Background Glow Effect */
.hero-glow {
    position: absolute;
    top: 20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    z-index: 1;
    pointer-events: none;
    filter: blur(40px);
}

/* ==========================================================================
   Section Layout Boilerplate
   ========================================================================== */
section {
    padding: 6rem 0;
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 4rem;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

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

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   Skills Section
   ========================================================================== */
/* Fixed 2x2 grid on desktop — prevents 4th card from floating on its own row */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.skill-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.skill-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 0% 0%, rgba(99, 102, 241, 0.05) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.skill-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.skill-card:hover::before {
    opacity: 1;
}

.skill-icon {
    font-size: 1.75rem;
    /* Slightly larger icon for balance */
    color: var(--accent);
    margin-bottom: 1.5rem;
    background: rgba(99, 102, 241, 0.07);
    width: 68px;
    /* Box sized for breathable padding */
    height: 68px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-sm);
    border: 1px solid rgba(99, 102, 241, 0.15);
}

.skill-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
}

.skill-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    font-size: 0.8rem;
    background-color: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.2);
    color: #c7d2fe;
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-sm);
    font-weight: 500;
}

/* ==========================================================================
   Projects Section
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-normal);
}

.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.project-preview {
    height: 200px;
    background-color: #0d0d11;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    position: relative;
}

.preview-browser {
    display: flex;
    gap: 6px;
    margin-bottom: 2rem;
}

.browser-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.browser-dot.red {
    background-color: #ef4444;
}

.browser-dot.yellow {
    background-color: #f59e0b;
}

.browser-dot.green {
    background-color: #10b981;
}

.preview-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: var(--text-secondary);
    font-weight: 600;
    gap: 0.75rem;
}

.preview-icon {
    font-size: 2.5rem;
    color: var(--accent);
}

.project-details {
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.project-header h3 {
    font-size: 1.3rem;
}

.status-badge {
    font-size: 0.75rem;
    background-color: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.2);
    padding: 0.2rem 0.5rem;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
}

.project-details p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.project-links {
    margin-top: auto;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--accent);
}

.project-link:hover {
    color: var(--accent-light);
}

/* Status badge for upcoming works */
.status-badge.status-upcoming {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--accent-light);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

/* ==========================================================================
   Contact Section & Form
   ========================================================================== */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.contact-info {
    max-width: 480px;
}

.contact-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
}

.contact-details-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.1rem;
}

.contact-item i {
    color: var(--accent);
    font-size: 1.25rem;
}

.contact-form-wrapper {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius-sm);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    width: 100%;
}

/* Scoped placeholder rule */
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #a1a1aa;
    opacity: 1;
}

/* Global override with !important to ensure browser resets don't interfere */
input::placeholder,
textarea::placeholder {
    color: #a1a1aa !important;
    opacity: 1;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

/* ==========================================================================
   Footer Section
   ========================================================================== */
.footer {
    padding: 2.5rem 0;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

.footer-socials {
    display: flex;
    gap: 1.5rem;
}

.footer-socials a {
    color: var(--text-muted);
    font-size: 1.2rem;
}

.footer-socials a:hover {
    color: var(--accent-light);
}

/* ==========================================================================
   Responsive Media Queries (Mobile First)
   ========================================================================== */

/* Up to Tablet (Medium Devices) */
@media (max-width: 992px) {
    .contact-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .contact-info {
        max-width: 100%;
        text-align: center;
    }

    .contact-info .section-title {
        text-align: center;
    }

    .contact-details-list {
        align-items: center;
    }
}

/* Up to Mobile (Small Devices) */
@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }

    .navbar-container {
        position: relative;
    }

    /* Responsive layout changes for Hero */
    .hero {
        padding-top: calc(var(--header-height) + 2rem);
        padding-bottom: 4rem;
        text-align: center;
    }

    .hero-content {
        margin: 0 auto;
    }

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

    .hero-subtext {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
        flex-direction: column;
        width: 100%;
        max-width: 320px;
        margin: 0 auto;
    }

    .section-title {
        font-size: 1.8rem;
    }

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

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

    .contact-form-wrapper {
        padding: 1.5rem;
    }

    .footer-container {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }
}