:root {
    --primary: #c6c6c6;
    --background: #0f1418;
    --surface: #1b2025;
    --surface-variant: #31353a;
    --on-surface: #dfe3e9;
    --on-surface-variant: #cfc4c5;
    --secondary: #adc6ff;
    --tertiary: #ddb7ff;
    --error: #ffb4ab;
    --accent-glow: rgba(173, 198, 255, 0.1);
    --transition: all 0.3s ease;
    --header-height: 80px;
    --container-max-width: 1280px;
}

/* =========================================
   1. RESET & BASE (Common)
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    width: 100%;
    overflow-x: hidden;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background);
    color: var(--on-surface);
    line-height: 1.6;
    width: 100%;
    overflow-x: hidden;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .font-space {
    font-family: 'Space Grotesk', sans-serif;
    color: #ffffff;
}

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

ul {
    list-style: none;
}

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

/* =========================================
   2. MOBILE STYLES (Default)
   ========================================= */

/* Utilities */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section-padding {
    padding: 60px 0;
}

.section-header {
    margin-bottom: 40px;
    text-align: center;
}

.section-subtitle {
    margin-top: 12px;
}

.accent-line {
    width: 60px;
    height: 4px;
    background: #ffffff;
    margin: 20px auto 0;
    border-radius: 2px;
}

.accent-line-center {
    width: 40px;
    height: 4px;
    background: #ffffff;
    margin: 20px auto 0;
    border-radius: 2px;
}

.text-center { text-align: center; }
.text-muted { color: var(--on-surface-variant); }
.text-secondary { color: var(--secondary); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    width: 100%; /* Full width on mobile */
}

.btn-primary {
    background: #ffffff;
    color: #000000;
}

.btn-outline {
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-xl {
    padding: 16px 32px;
}

.glass-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(12px);
    border-radius: 20px;
}

.icon-card {
    aspect-ratio: 16/9;
    display: flex;
    align-items: center;
    justify-content: center;
}

.large-icon {
    font-size: 60px;
    opacity: 0.1;
}

.medium-icon {
    font-size: 40px;
    opacity: 0.1;
}

/* Header */
header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(15, 20, 24, 0.8);
    backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.logo {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -1px;
}

header .btn {
    width: auto;
    padding: 8px 16px;
    font-size: 14px;
}

/* Hero Section */
.hero {
    min-height: auto;
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 60px;
    display: flex;
    align-items: center;
    position: relative;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
}

.hero-content h1 {
    font-size: 36px;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 17px;
    color: var(--on-surface-variant);
    margin-bottom: 32px;
}

.hero-btns {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.hero-image img {
    border-radius: 20px;
    width: 100%;
}

/* Features Section */
.features-header {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
    margin-bottom: 48px;
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

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

.feature-item h3 {
    font-size: 22px;
    margin-bottom: 12px;
}

.feature-icon {
    font-size: 32px;
    color: var(--secondary);
    margin-bottom: 16px;
}

/* Services Section */
.services-list {
    display: flex;
    flex-direction: column;
    gap: 64px;
}

.service-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

.service-content {
    text-align: center;
    order: 2;
}

.service-row .glass-card {
    order: 1;
}

.service-content h3 {
    font-size: 28px;
    margin-bottom: 16px;
}

.service-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
}

.tag {
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 100px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--secondary);
}

/* Process Section */
.process-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
}

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

.process-desc {
    margin-top: 8px;
}

.process-number {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 20px;
    font-weight: 700;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.project-card {
    border-radius: 20px;
}

.project-info {
    padding: 24px;
}

.project-info h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

/* Mentors Section */
.mentors-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

.mentor-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--surface-variant);
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Internship CTA */
.cta-box {
    padding: 40px 24px;
    background: linear-gradient(135deg, var(--surface) 0%, #0a0f13 100%);
    border-radius: 32px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
}

.cta-box h2 {
    font-size: 28px;
}

.cta-box p {
    margin: 16px 0 32px;
}

.internship-list {
    margin-bottom: 32px;
    text-align: left;
    display: inline-block;
}

.internship-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 15px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.stat-item {
    padding: 20px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--secondary);
    display: block;
}

.stat-label {
    font-size: 10px;
    text-transform: uppercase;
}

/* Final CTA Card */
.cta-card {
    padding: 48px 24px;
}

.cta-card h2 {
    font-size: 32px;
    margin-bottom: 20px;
}

.cta-card p {
    margin-bottom: 32px;
}

.cta-card .hero-btns {
    flex-direction: column;
}

/* Footer */
footer {
    padding: 60px 0 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 48px;
    text-align: center;
}

.footer-column h4 {
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 20px;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    font-size: 14px;
}

.footer-logo {
    margin-bottom: 20px;
}

.footer-bottom {
    padding-top: 32px;
    margin-top: 48px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
    font-size: 11px;
}

.social-links {
    display: flex;
    gap: 20px;
}

/* Cookie Banner */
.cookie-banner {
    position: fixed;
    bottom: 16px;
    left: 16px;
    right: 16px;
    width: auto;
    z-index: 2000;
    padding: 24px;
    display: none;
}

.cookie-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.cookie-title {
    font-size: 18px;
}

.cookie-desc {
    font-size: 13px;
    margin-bottom: 24px;
}

.cookie-actions {
    display: grid;
    gap: 10px;
}

.cookie-actions .btn {
    width: 100%;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate {
    animation: fadeIn 0.8s ease forwards;
}


/* =========================================
   3. DESKTOP STYLES (min-width: 1024px)
   ========================================= */
@media (min-width: 1024px) {
    /* Utilities */
    .section-padding {
        padding: 100px 0;
    }

    .section-header {
        margin-bottom: 80px;
        text-align: left;
    }

    .section-subtitle {
        margin-top: 16px;
    }

    .accent-line {
        margin: 24px 0 0;
    }

    .accent-line-center {
        margin: 24px auto 0;
    }

    .btn {
        width: auto;
    }

    .btn-primary:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 20px rgba(255, 255, 255, 0.2);
    }

    .btn-outline:hover {
        background: rgba(255, 255, 255, 0.1);
        border-color: #ffffff;
    }

    .btn-xl {
        padding: 16px 40px;
    }

    .large-icon {
        font-size: 80px;
    }

    .medium-icon {
        font-size: 48px;
    }

    /* Header */
    .logo {
        font-size: 24px;
    }

    header .btn {
        padding: 10px 24px;
        font-size: 16px;
    }

    /* Hero Section */
    .hero {
        min-height: 90vh;
        padding-top: var(--header-height);
        padding-bottom: 0;
    }

    .hero-grid {
        grid-template-columns: 1.2fr 1fr;
        gap: 60px;
        text-align: left;
    }

    .hero-content h1 {
        font-size: 64px;
        margin-bottom: 24px;
    }

    .hero-content p {
        font-size: 20px;
        margin-bottom: 40px;
    }

    .hero-btns {
        flex-direction: row;
        gap: 16px;
    }

    /* Features Section */
    .features-header {
        grid-template-columns: 1fr 2fr;
        gap: 80px;
        text-align: left;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 48px;
    }

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

    .feature-item h3 {
        font-size: 24px;
        margin-bottom: 16px;
    }

    .feature-icon {
        margin-bottom: 24px;
    }

    /* Services Section */
    .services-list {
        gap: 120px;
    }

    .service-row {
        grid-template-columns: 1fr 1fr;
        gap: 80px;
    }

    .service-content {
        text-align: left;
        order: unset;
    }

    .service-row .glass-card {
        order: unset;
    }

    .service-row.reverse {
        direction: rtl;
    }

    .service-row.reverse > * {
        direction: ltr;
    }

    .service-content h3 {
        font-size: 40px;
        margin-bottom: 24px;
    }

    .service-tags {
        justify-content: flex-start;
        gap: 12px;
        margin-top: 24px;
    }

    .tag {
        font-size: 12px;
    }

    /* Process Section */
    .process-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 40px;
    }

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

    .process-desc {
        margin-top: 12px;
    }

    .process-number {
        width: 80px;
        height: 80px;
        margin: 0 0 24px;
        font-size: 24px;
    }

    .process-item:hover .process-number {
        border-color: var(--secondary);
        box-shadow: 0 0 30px rgba(173, 198, 255, 0.2);
    }

    /* Projects Section */
    .projects-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 32px;
    }

    .project-card:hover .project-image img {
        transform: scale(1.1);
    }

    .project-info {
        padding: 32px;
    }

    /* Mentors Section */
    .mentors-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 48px;
    }

    .mentor-avatar {
        width: 120px;
        height: 120px;
        margin: 0 auto 24px;
    }

    /* Internship CTA */
    .cta-box {
        padding: 80px;
        grid-template-columns: 1.5fr 1fr;
        gap: 80px;
        text-align: left;
    }

    .cta-box h2 {
        font-size: 42px;
    }

    .cta-box p {
        margin: 24px 0 40px;
    }

    .internship-list {
        margin-bottom: 40px;
        display: block;
    }

    .internship-list li {
        margin-bottom: 16px;
        font-size: 16px;
    }

    .stats-grid {
        gap: 24px;
    }

    .stat-item {
        padding: 32px;
    }

    .stat-value {
        font-size: 32px;
        margin-bottom: 8px;
    }

    .stat-label {
        font-size: 12px;
    }

    /* Final CTA Card */
    .cta-card {
        padding: 80px;
    }

    .cta-card h2 {
        font-size: 48px;
        margin-bottom: 24px;
    }

    .cta-card p {
        max-width: 600px;
        margin: 0 auto 40px;
    }

    .cta-card .hero-btns {
        flex-direction: row;
        justify-content: center;
    }

    /* Footer */
    footer {
        padding: 100px 0 40px;
    }

    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr 1fr;
        gap: 80px;
        text-align: left;
    }

    .footer-column h4 {
        font-size: 14px;
    }

    .footer-bottom {
        padding-top: 40px;
        margin-top: 80px;
        flex-direction: row;
        justify-content: space-between;
        font-size: 12px;
    }

    .social-links {
        gap: 24px;
    }

    /* Cookie Banner */
    .cookie-banner {
        bottom: 32px;
        right: 32px;
        left: auto;
        width: 400px;
        padding: 32px;
    }
}