/* ============================================================
   global.css — Shared Layout, Typography, and Components
   Styles used across all pages of the site.
   ============================================================ */

/* ---- Base ---- */
body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: var(--weight-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

/* ---- Typography ---- */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
}

h1 {
    font-size: var(--text-4xl);
}

h2 {
    font-size: var(--text-3xl);
}

h3 {
    font-size: var(--text-2xl);
}

h4 {
    font-size: var(--text-xl);
}

p {
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ---- Links ---- */
a {
    color: var(--color-accent-primary);
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-accent-secondary);
}

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

.section {
    padding: var(--space-4xl) 0;
}

/* ---- Navigation ---- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(11, 11, 26, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: background var(--transition-base);
}

/* Light-mode nav uses a translucent white backdrop */
[data-theme="light"] .nav {
    background: rgba(245, 245, 250, 0.85);
}

.nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Logo / site name in the nav */
.nav__logo {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    transition: color var(--transition-fast);
}

.nav__logo:hover {
    color: var(--color-accent-primary);
}

/* Navigation links container */
.nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    list-style: none;
}

/* Individual nav link */
.nav__link {
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--space-xs) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
    color: var(--color-accent-primary);
}

/* Animated underline on hover */
.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-primary);
    transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link--active::after {
    width: 100%;
}

/* ---- Mobile Navigation ---- */
.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--space-xs);
}

/* Hamburger icon lines */
.nav__toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ---- Theme Toggle Button ---- */
/* Sun/moon button in the nav for switching dark↔light themes */
.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-full);
    cursor: pointer;
    width: 2.25rem;
    height: 2.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: border-color var(--transition-fast),
        transform var(--transition-fast),
        background var(--transition-fast);
    color: var(--color-text-secondary);
}

.theme-toggle:hover {
    border-color: var(--color-accent-primary);
    background: var(--color-accent-primary-10);
    transform: rotate(15deg);
}

/* Smooth rotation when toggling */
.theme-toggle--spin {
    animation: themeToggleSpin 0.4s ease;
}

@keyframes themeToggleSpin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

/* Animated hamburger → X transformation */
.nav__toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav__toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav__toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--border-radius-full);
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all var(--transition-base);
}

/* Primary button — filled with accent glow */
.btn--primary {
    background: var(--color-accent-primary);
    color: var(--color-bg-primary);
    box-shadow: var(--shadow-glow-primary);
}

.btn--primary:hover {
    background: #33ecff;
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 229, 255, 0.5);
    color: var(--color-bg-primary);
}

/* Secondary button — outline style */
.btn--secondary {
    background: transparent;
    color: var(--color-accent-primary);
    border: 1px solid var(--color-accent-primary);
}

.btn--secondary:hover {
    background: var(--color-accent-primary-10);
    transform: translateY(-2px);
    color: var(--color-accent-primary);
}

/* ---- Cards ---- */
.card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-base);
}

.card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ---- Tags / Badges ---- */
.tag {
    display: inline-block;
    padding: var(--space-2xs) var(--space-sm);
    border-radius: var(--border-radius-full);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: var(--color-accent-primary-10);
    color: var(--color-accent-primary);
    border: 1px solid var(--color-accent-primary-20);
}

/* ---- Footer ---- */
.footer {
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer__text {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.footer__links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-md);
    list-style: none;
}

.footer__link {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    transition: color var(--transition-fast);
}

.footer__link:hover {
    color: var(--color-accent-primary);
}

/* ---- Scroll spacer (for fixed nav) ---- */
.nav-spacer {
    height: var(--nav-height);
}

/* ---- Section Headers ---- */
.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-header__subtitle {
    display: inline-block;
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: var(--weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent-primary);
    margin-bottom: var(--space-sm);
}

.section-header__title {
    margin-bottom: var(--space-md);
}

.section-header__desc {
    max-width: 600px;
    margin: 0 auto;
    font-size: var(--text-lg);
}

/* ---- Responsive: Tablet and below ---- */
@media (max-width: 768px) {

    /* Show hamburger, hide desktop links */
    .nav__toggle {
        display: flex;
    }

    .nav__links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(11, 11, 26, 0.95);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-md) 0;
    }

    /* Show links when nav is open */
    .nav__links.active {
        display: flex;
    }

    .nav__link {
        padding: var(--space-sm) var(--space-lg);
    }

    /* Reduce section padding on mobile */
    .section {
        padding: var(--space-3xl) 0;
    }

    .container {
        padding: 0 var(--space-md);
    }
}

/* ---- Page Transitions ---- */
/* Fade in when page loads, fade out before navigating */
body {
    animation: pageIn 0.4s ease both;
}

body.page-leaving {
    animation: pageOut 0.25s ease both;
}

@keyframes pageIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pageOut {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
}

/* ---- Scroll-triggered Fade-in Animations ---- */
/* Elements with .fade-in start invisible and slide up into view.
   The --delay custom property enables staggered reveals for siblings. */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    transition-delay: var(--delay, 0s);
}

/* Once the IntersectionObserver adds .visible, animate in */
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Slide-in variants for horizontal movement */
.fade-in--left {
    transform: translateX(-30px);
}

.fade-in--left.visible {
    transform: translateX(0);
}

.fade-in--right {
    transform: translateX(30px);
}

.fade-in--right.visible {
    transform: translateX(0);
}

/* Respect user preference for reduced motion */
@media (prefers-reduced-motion: reduce) {

    body,
    body.page-leaving {
        animation: none;
    }

    .fade-in {
        opacity: 1;
        transform: none;
        transition: none;
    }
}