/* ============================================
   PORTFOLIO — Dark Teal Theme
   Typography: Syne (display) + DM Sans (body)
   ============================================ */

/* --- Custom Properties --- */
:root {
    --bg-deep:      #080c0b;
    --bg-primary:   #0b0f0e;
    --bg-surface:   #111917;
    --bg-elevated:  #182420;
    --bg-hover:     #1e2e29;

    --accent:       #5eada0;
    --accent-dim:   #3d8a7e;
    --accent-bright:#7ec8bc;
    --accent-glow:  rgba(94, 173, 160, 0.15);
    --accent-glow-strong: rgba(94, 173, 160, 0.25);

    --text-primary: #edf2f0;
    --text-secondary: #8a9e97;
    --text-muted:   #556b63;

    --border:       #1a2825;
    --border-hover: #2a3f39;

    --radius-sm:    6px;
    --radius-md:    12px;
    --radius-lg:    20px;
    --radius-full:  9999px;

    --font-display: 'Syne', sans-serif;
    --font-body:    'DM Sans', sans-serif;

    --transition-fast:   150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base:   250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow:   400ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    --container:    1120px;
    --gutter:       clamp(1.25rem, 4vw, 3rem);
}


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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    background-color: var(--bg-deep);
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

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

button {
    font: inherit;
    color: inherit;
    background: none;
    border: none;
    cursor: pointer;
}


/* --- Utility: Reveal Animation --- */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition:
        opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
        transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}


/* ============================================
   NAVIGATION
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0 var(--gutter);
    transition: background-color var(--transition-base), backdrop-filter var(--transition-base);
}

.nav.is-scrolled {
    background-color: rgba(8, 12, 11, 0.82);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
    border-bottom: 1px solid var(--border);
}

.nav__container {
    max-width: var(--container);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
    transition: opacity var(--transition-fast);
}

.nav__logo:hover {
    opacity: 0.8;
}

.nav__logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    background: var(--accent);
    color: var(--bg-deep);
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 0.8rem;
    letter-spacing: -0.02em;
}

.nav__logo-text {
    letter-spacing: -0.02em;
}

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

.nav__link {
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width var(--transition-base);
}

.nav__link:hover {
    color: var(--text-primary);
}

.nav__link:hover::after {
    width: 100%;
}


/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.7rem 1.5rem;
    border-radius: var(--radius-full);
    transition:
        background-color var(--transition-fast),
        color var(--transition-fast),
        border-color var(--transition-fast),
        box-shadow var(--transition-base),
        transform var(--transition-fast);
    cursor: pointer;
    white-space: nowrap;
}

.btn:active {
    transform: scale(0.97);
}

.btn--primary {
    background: var(--accent);
    color: var(--bg-deep);
    font-weight: 500;
}

.btn--primary:hover {
    background: var(--accent-bright);
    box-shadow: 0 0 24px var(--accent-glow);
}

.btn--outline {
    border: 1px solid var(--border-hover);
    color: var(--text-primary);
    background: transparent;
}

.btn--outline:hover {
    border-color: var(--accent-dim);
    color: var(--accent-bright);
    background: rgba(94, 173, 160, 0.06);
}

.btn--nav {
    background: var(--accent);
    color: var(--bg-deep);
    font-weight: 500;
    font-size: 0.85rem;
    padding: 0.55rem 1.25rem;
}

.btn--nav:hover {
    background: var(--accent-bright);
}

/* Mobile nav toggle */
.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
    z-index: 110;
}

.nav__toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 1px;
    transition: transform var(--transition-base), opacity var(--transition-fast);
    transform-origin: center;
}

.nav__toggle.is-active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

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


/* ============================================
   PROJECTS SECTION
   ============================================ */
.projects {
    position: relative;
    padding: 7rem var(--gutter) 8rem;
}

.projects__container {
    max-width: var(--container);
    margin: 0 auto;
}

.projects__header {
    text-align: center;
    margin-bottom: 4rem;
}

.projects__label {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.projects__title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.03em;
    color: var(--text-primary);
}


/* --- Cards Grid --- */
.projects__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

/* Last card (odd) spans full width for balanced layout */
.projects__grid .card:last-child:nth-child(odd) {
    grid-column: 1 / -1;
    max-width: calc(50% - 0.75rem);
    justify-self: center;
}


/* --- Card --- */
.card {
    position: relative;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition:
        border-color var(--transition-base),
        box-shadow var(--transition-slow),
        transform var(--transition-base),
        background-color var(--transition-base);
    overflow: hidden;
}

/* Teal glow line at top of card */
.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 2rem;
    right: 2rem;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-dim), transparent);
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.card:hover {
    border-color: var(--border-hover);
    background: var(--bg-elevated);
    transform: translateY(-4px);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(94, 173, 160, 0.08),
        0 0 60px -12px var(--accent-glow);
}

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

/* Stagger animation delay for cards */
.card.reveal {
    transition-delay: calc(var(--card-delay, 0) * 100ms);
}

.card__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.25rem;
}

.card__icon {
    font-size: 1.75rem;
    line-height: 1;
}

.card__number {
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.card__title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    line-height: 1.3;
}

.card__desc {
    font-size: 0.925rem;
    line-height: 1.65;
    color: var(--text-secondary);
    flex-grow: 1;
}

.card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.3rem 0.7rem;
    border-radius: var(--radius-full);
    background: rgba(94, 173, 160, 0.08);
    color: var(--accent);
    border: 1px solid rgba(94, 173, 160, 0.1);
    letter-spacing: 0.01em;
}

.card__link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-top: 0.75rem;
    transition: color var(--transition-fast), gap var(--transition-base);
}

.card__link svg {
    transition: transform var(--transition-base);
}

.card__link:hover {
    color: var(--accent);
    gap: 10px;
}

.card__link:hover svg {
    transform: translate(2px, -2px);
}


/* ============================================
   FOOTER
   ============================================ */
.footer {
    position: relative;
    padding: 0 var(--gutter) 3rem;
}

.footer__container {
    max-width: var(--container);
    margin: 0 auto;
}

.footer__cta {
    text-align: center;
    padding: 5rem 2rem;
    border-radius: var(--radius-lg);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
}

/* Subtle glow behind CTA */
.footer__cta::before {
    content: '';
    position: absolute;
    top: -40%;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
    height: 300px;
    background: radial-gradient(ellipse, var(--accent-glow) 0%, transparent 70%);
    pointer-events: none;
    filter: blur(30px);
}

.footer__title {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    position: relative;
}

.footer__text {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    position: relative;
}

.footer__cta .btn {
    position: relative;
}

.footer__bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
}

.footer__copy {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer__socials {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer__social {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.footer__social:hover {
    color: var(--accent);
    background: rgba(94, 173, 160, 0.08);
}


/* ============================================
   MOBILE RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .nav__links,
    .btn--nav {
        display: none;
    }

    .nav__toggle {
        display: flex;
    }

    /* Mobile menu overlay */
    .nav__links.is-open {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        position: fixed;
        inset: 0;
        background: rgba(8, 12, 11, 0.96);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        z-index: 105;
    }

    .nav__links.is-open .nav__link {
        font-family: var(--font-display);
        font-size: 1.5rem;
        font-weight: 600;
        color: var(--text-primary);
    }

    .projects {
        padding: 5.5rem var(--gutter) 5rem;
    }

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

    .projects__grid .card:last-child:nth-child(odd) {
        grid-column: auto;
        max-width: none;
        justify-self: auto;
    }

    .card {
        padding: 1.5rem;
    }

    .footer__cta {
        padding: 3rem 1.5rem;
    }

    .footer__bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* ============================================
   SUBTLE ENHANCEMENTS
   ============================================ */

/* Selection color */
::selection {
    background: rgba(94, 173, 160, 0.3);
    color: var(--text-primary);
}

/* Scrollbar styling (webkit) */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-deep);
}

::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-dim);
}

/* Focus styles for accessibility */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

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

    html {
        scroll-behavior: auto;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}