/* ============================================
   STEMfy.gr — Main Stylesheet
   Purple Galaxy Aesthetic
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - New Purple Theme */
    --bg-deep: #0a0812;
    --bg-surface: rgba(18, 12, 28, 0.85);
    --bg-panel: rgba(18, 12, 28, 0.9);

    --purple-dim: #2a1a4a;
    --purple-mid: #6a4a9e;
    --purple-bright: #b08af0;
    --purple-glow: #d4a0ff;
    --pink-mid: #9a4a8a;

    --white: #f8f4ff;
    --white-dim: rgba(248, 244, 255, 0.7);
    --white-soft: #e8e0f0;
    --gray: #9a8aaa;

    --accent: #ff7aec;
    --accent-cyan: #6bfff0;

    /* Legacy color aliases for compatibility */
    --color-bg-deep: var(--bg-deep);
    --color-bg-primary: #0f0a18;
    --color-bg-secondary: #150f22;
    --color-bg-panel: var(--bg-panel);
    --color-blue-bright: var(--purple-bright);
    --color-blue-light: var(--purple-glow);
    --color-blue-medium: var(--purple-mid);
    --color-blue-dark: var(--purple-dim);
    --color-white: var(--white);
    --color-white-soft: var(--white-soft);
    --color-gray: var(--gray);
    --color-accent-pink: var(--accent);
    --color-accent-purple: var(--purple-bright);
    --color-accent-cyan: var(--accent-cyan);

    /* Typography */
    --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-pixel: 'Press Start 2P', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 5rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;

    /* Borders */
    --border-radius: 12px;
    --border-radius-lg: 24px;

    /* Shadows */
    --shadow-glow: 0 0 20px rgba(176, 138, 240, 0.3);
    --shadow-glow-strong: 0 0 40px rgba(176, 138, 240, 0.5);
    --shadow-card: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 40px rgba(176, 138, 240, 0.15);
}

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

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

body {
    font-family: var(--font-body);
    background: var(--bg-deep);
    color: var(--white);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Starfield Canvas Background */
#starfield {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Page wrapper */
.page {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   NAVIGATION
   ============================================ */

nav {
    padding: 1.5rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(to bottom, rgba(10, 8, 18, 0.9), transparent);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.logo-icon {
    width: 48px;
    height: 48px;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
    animation: rotate-slow 60s linear infinite;
}

@keyframes rotate-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
}

.logo-text span,
.logo-text--accent {
    color: var(--purple-bright);
}

.nav-links {
    display: flex;
    gap: 0.75rem;
    list-style: none;
}

.nav-links a {
    color: var(--white-dim);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.6rem 1.2rem;
    border-radius: 10px;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.nav-links a:hover {
    color: var(--white);
    background: rgba(176, 138, 240, 0.1);
    border-color: rgba(176, 138, 240, 0.2);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: rgba(176, 138, 240, 0.1);
    border: 1px solid rgba(176, 138, 240, 0.3);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--purple-bright);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.hero-badge .pulse {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s ease infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero h1 {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--white) 0%, var(--purple-bright) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease 0.1s forwards;
    opacity: 0;
}

.hero .tagline {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--white-dim);
    max-width: 550px;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease 0.2s forwards;
    opacity: 0;
    line-height: 1.7;
}

.hero .tagline strong {
    color: var(--white);
    font-weight: 600;
}

/* ============================================
   NAVIGATION CARDS (Home page grid)
   ============================================ */

.nav-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    max-width: 1000px;
    width: 100%;
    padding: 0 1rem;
    animation: fadeInUp 0.8s ease 0.3s forwards;
    opacity: 0;
}

@media (max-width: 900px) {
    .nav-cards { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 500px) {
    .nav-cards { grid-template-columns: 1fr; max-width: 300px; }
}

.nav-card {
    background: var(--bg-surface);
    border: 1px solid rgba(176, 138, 240, 0.15);
    border-radius: 24px;
    padding: 1.5rem;
    text-align: center;
    text-decoration: none;
    color: var(--white);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.nav-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(176, 138, 240, 0.1), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: rgba(176, 138, 240, 0.5);
    box-shadow: var(--shadow-card);
}

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

.nav-card .icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
    border-radius: 16px;
    overflow: hidden;
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(176, 138, 240, 0.1);
    flex-shrink: 0;
}

.nav-card .icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    transition: transform 0.3s ease;
}

.nav-card:hover .icon img {
    transform: scale(1.1);
}

.nav-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}

.nav-card p {
    font-size: 0.85rem;
    color: var(--white-dim);
    line-height: 1.5;
    position: relative;
    z-index: 1;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
    padding: 2rem;
    text-align: center;
    color: var(--white-dim);
    font-size: 0.85rem;
}

footer a {
    color: var(--purple-bright);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: rgba(176, 138, 240, 0.1);
    border: 1px solid rgba(176, 138, 240, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--purple-mid);
    border-color: var(--purple-mid);
    transform: translateY(-3px);
    text-decoration: none;
}

.social-links svg {
    width: 20px;
    height: 20px;
    fill: var(--white);
}

/* ============================================
   PLACEHOLDER PAGES (Coming Soon)
   ============================================ */

.wrap {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem;
    text-align: center;
}

.card {
    background: var(--bg-surface);
    border: 1px solid rgba(176, 138, 240, 0.2);
    border-radius: 24px;
    padding: 2rem;
    max-width: 720px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.35);
}

.card h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--white) 0%, var(--purple-bright) 50%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.card p {
    color: var(--white-dim);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.card a,
.btn {
    display: inline-block;
    padding: 0.65rem 1.1rem;
    border-radius: 12px;
    text-decoration: none;
    color: var(--white);
    border: 1px solid rgba(176, 138, 240, 0.35);
    background: rgba(176, 138, 240, 0.12);
    transition: all 0.3s ease;
}

.card a:hover,
.btn:hover {
    background: rgba(176, 138, 240, 0.2);
    border-color: rgba(176, 138, 240, 0.55);
}

/* ============================================
   LEGACY HOME PAGE STYLES (compatibility)
   ============================================ */

.home {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    gap: var(--space-xl);
}

.home__header {
    text-align: center;
    animation: fadeInUp 0.8s ease-out;
}

.logo-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
}

#galaxy-logo {
    image-rendering: pixelated;
    filter: drop-shadow(0 0 30px rgba(176, 138, 240, 0.4));
}

.motto {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--purple-glow);
    margin-top: var(--space-md);
    letter-spacing: 1px;
    animation: pulse 3s ease-in-out infinite;
}

/* Simulations Section */
.simulations {
    width: 100%;
    max-width: 900px;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray);
    text-align: center;
    margin-bottom: var(--space-lg);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.simulations__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-lg);
}

/* Simulation Cards */
.sim-card {
    background: var(--bg-panel);
    border: 1px solid var(--purple-dim);
    border-radius: var(--border-radius-lg);
    padding: var(--space-lg);
    text-align: center;
    text-decoration: none;
    color: inherit;
    transition:
        transform var(--transition-normal),
        border-color var(--transition-normal),
        box-shadow var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.sim-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--purple-bright), transparent);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.sim-card--active {
    cursor: pointer;
}

.sim-card--active:hover {
    transform: translateY(-4px);
    border-color: var(--purple-bright);
    box-shadow: var(--shadow-glow);
}

.sim-card--active:hover::before {
    opacity: 1;
}

.sim-card--coming {
    opacity: 0.6;
    cursor: default;
}

.sim-card__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-md);
    color: var(--purple-bright);
}

.sim-card__svg {
    width: 100%;
    height: 100%;
}

.sim-card__title {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.sim-card__desc {
    font-size: 0.875rem;
    color: var(--gray);
    margin-bottom: var(--space-md);
}

.sim-card__badge {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 600;
    padding: var(--space-xs) var(--space-sm);
    border-radius: 4px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.sim-card__badge--live {
    background: rgba(176, 138, 240, 0.2);
    color: var(--purple-bright);
    border: 1px solid var(--purple-bright);
}

.sim-card__badge--soon {
    background: rgba(154, 138, 170, 0.2);
    color: var(--gray);
    border: 1px solid var(--gray);
}

/* Navigation */
.home__nav {
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.nav-link {
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--gray);
    text-decoration: none;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--border-radius);
    transition:
        color var(--transition-fast),
        background-color var(--transition-fast);
}

.nav-link:hover {
    color: var(--white);
    background-color: rgba(176, 138, 240, 0.1);
}

/* ============================================
   ABOUT PAGE
   ============================================ */

.about {
    min-height: 100vh;
    padding: var(--space-xxl) var(--space-lg);
    max-width: 700px;
    margin: 0 auto;
}

.about__header {
    text-align: center;
    margin-bottom: var(--space-xxl);
}

.about__logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
    display: inline-block;
    transition: text-shadow var(--transition-normal);
}

.about__logo:hover {
    text-shadow: var(--shadow-glow);
}

.about__logo span {
    color: var(--purple-bright);
}

.about__section {
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.6s ease-out backwards;
}

.about__section:nth-child(2) { animation-delay: 0.1s; }
.about__section:nth-child(3) { animation-delay: 0.2s; }
.about__section:nth-child(4) { animation-delay: 0.3s; }

.about__section h2 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--purple-bright);
    margin-bottom: var(--space-md);
    letter-spacing: 1px;
}

.about__section p {
    color: var(--white-soft);
    line-height: 1.8;
}

.about__social {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--gray);
    text-decoration: none;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.social-link:hover {
    color: var(--purple-bright);
}

.social-link svg {
    width: 20px;
    height: 20px;
}

.about__back {
    text-align: center;
    margin-top: var(--space-xxl);
}

.back-link {
    font-family: var(--font-display);
    font-size: 0.875rem;
    color: var(--gray);
    text-decoration: none;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid rgba(176, 138, 240, 0.3);
    border-radius: var(--border-radius);
    transition:
        color var(--transition-fast),
        border-color var(--transition-fast),
        background var(--transition-fast);
}

.back-link:hover {
    color: var(--white);
    border-color: var(--purple-bright);
    background: rgba(176, 138, 240, 0.1);
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(176, 138, 240, 0.3);
    }
    50% {
        box-shadow: 0 0 40px rgba(176, 138, 240, 0.6);
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Pixel Corner Decorations (legacy support) */
.pixel-corner {
    position: fixed;
    width: 40px;
    height: 40px;
    z-index: 100;
    pointer-events: none;
    opacity: 0.6;
}

.pixel-corner::before,
.pixel-corner::after {
    content: '';
    position: absolute;
    background-color: var(--purple-bright);
}

.pixel-corner--top-left { top: 12px; left: 12px; }
.pixel-corner--top-left::before { width: 16px; height: 4px; top: 0; left: 0; }
.pixel-corner--top-left::after { width: 4px; height: 16px; top: 0; left: 0; }

.pixel-corner--top-right { top: 12px; right: 12px; }
.pixel-corner--top-right::before { width: 16px; height: 4px; top: 0; right: 0; }
.pixel-corner--top-right::after { width: 4px; height: 16px; top: 0; right: 0; }

.pixel-corner--bottom-left { bottom: 12px; left: 12px; }
.pixel-corner--bottom-left::before { width: 16px; height: 4px; bottom: 0; left: 0; }
.pixel-corner--bottom-left::after { width: 4px; height: 16px; bottom: 0; left: 0; }

.pixel-corner--bottom-right { bottom: 12px; right: 12px; }
.pixel-corner--bottom-right::before { width: 16px; height: 4px; bottom: 0; right: 0; }
.pixel-corner--bottom-right::after { width: 4px; height: 16px; bottom: 0; right: 0; }

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 768px) {
    nav {
        padding: 1rem 1.5rem;
    }

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

    .nav-links {
        gap: 0.5rem;
    }

    .nav-links a {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }

    .hero h1 {
        font-size: clamp(2rem, 6vw, 3.5rem);
    }

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

    #galaxy-logo {
        width: 150px;
        height: 150px;
    }

    .simulations__grid {
        grid-template-columns: 1fr;
        max-width: 320px;
        margin: 0 auto;
    }

    .pixel-corner {
        width: 24px;
        height: 24px;
    }

    .pixel-corner--top-left::before,
    .pixel-corner--top-right::before,
    .pixel-corner--bottom-left::before,
    .pixel-corner--bottom-right::before {
        width: 12px;
        height: 3px;
    }

    .pixel-corner--top-left::after,
    .pixel-corner--top-right::after,
    .pixel-corner--bottom-left::after,
    .pixel-corner--bottom-right::after {
        width: 3px;
        height: 12px;
    }
}

@media (max-width: 480px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }

    .home {
        padding: var(--space-md);
    }

    .sim-card {
        padding: var(--space-md);
    }

    .sim-card__icon {
        width: 48px;
        height: 48px;
    }

    .nav-card {
        padding: 1.25rem;
    }

    .nav-card .icon {
        width: 60px;
        height: 60px;
    }
}