/* ==========================================================================
   NuBnByDesign Portal — Design System + Styles
   All values reference design tokens. No magic numbers.
   ========================================================================== */

/* --- Design Tokens --- */
:root {
    /* Colors */
    --bg:              #0a0a0a;
    --surface:         #141414;
    --text-primary:    #e0dcd7;
    --text-secondary:  #8a8580;
    --accent:          #c9a227;
    --accent-hover:    #d4af37;
    --border:          #2a2a2a;

    /* Type Scale (1.25 ratio) — all Inter */
    --text-xs:   0.8rem;     /* 12.8px — fine print */
    --text-sm:   1rem;       /* 16px   — body */
    --text-md:   1.25rem;    /* 20px   — nav, project names */
    --text-lg:   1.563rem;   /* 25px   — section headings */
    --text-xl:   1.953rem;   /* 31px   — subheadings */
    --text-2xl:  2.441rem;   /* 39px   — page headline */
    --text-3xl:  3.052rem;   /* 49px   — hero headline (desktop) */

    /* Font Weights */
    --weight-regular:  400;
    --weight-medium:   500;
    --weight-semibold: 600;

    /* Spacing (8px base grid) */
    --space-1:  0.5rem;   /*  8px */
    --space-2:  1rem;     /* 16px */
    --space-3:  1.5rem;   /* 24px */
    --space-4:  2rem;     /* 32px */
    --space-5:  3rem;     /* 48px */
    --space-6:  4rem;     /* 64px */
    --space-7:  6rem;     /* 96px */

    /* Border Radius (3 values only) */
    --radius-sm:  4px;
    --radius-md:  8px;
    --radius-lg:  12px;

    /* Transitions */
    --transition: 200ms ease;
}

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

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    font-size: var(--text-sm);
    font-weight: var(--weight-regular);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg);
    min-height: 100vh;
}

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

ul {
    list-style: none;
}

/* --- Focus Visible (Accessibility) --- */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

/* --- Layout Container --- */
.nav,
.hero,
.section,
.footer {
    max-width: 64rem; /* 1024px */
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-3);
    padding-right: var(--space-3);
}

/* --- Navigation --- */
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--space-3);
    padding-bottom: var(--space-3);
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-md);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
    transition: opacity var(--transition);
}

.nav__logo:hover {
    opacity: 0.8;
}

.nav__icon {
    color: var(--text-primary);
    flex-shrink: 0;
}

.nav__links {
    display: flex;
    gap: var(--space-4);
}

.nav__link {
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: var(--text-secondary);
    transition: color var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent);
    transition: width var(--transition);
}

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

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

/* --- Hero --- */
.hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding-top: var(--space-7);
    padding-bottom: var(--space-7);
}

.hero__headline {
    font-size: var(--text-3xl);
    font-weight: var(--weight-semibold);
    line-height: 1.15;
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.hero__tagline {
    font-size: var(--text-md);
    font-weight: var(--weight-regular);
    color: var(--text-secondary);
    margin-bottom: var(--space-5);
    max-width: 32rem;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-md);
    background-color: var(--accent);
    color: var(--bg);
    border: 2px solid var(--accent);
    cursor: pointer;
    transition: background-color var(--transition), border-color var(--transition);
}

.btn:hover {
    background-color: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn--outline {
    background-color: transparent;
    color: var(--accent);
}

.btn--outline:hover {
    background-color: var(--accent);
    color: var(--bg);
}

/* --- Divider --- */
.divider {
    max-width: 64rem;
    margin: 0 auto;
    border: none;
    border-top: 1px solid var(--border);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-3);
    padding-right: var(--space-3);
}

/* --- Section --- */
.section {
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
}

.section__heading {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-5);
}

/* --- Project List --- */
.project-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.project-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: var(--space-4);
    padding-bottom: var(--space-3);
    border-bottom: 1px solid var(--border);
}

.project-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.project-row__name {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-md);
    font-weight: var(--weight-medium);
    color: var(--text-primary);
    white-space: nowrap;
    transition: color var(--transition);
}

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

.project-row__arrow {
    flex-shrink: 0;
    transition: transform var(--transition);
}

.project-row__name:hover .project-row__arrow {
    transform: translate(2px, -2px);
}

.project-row__desc {
    font-size: var(--text-sm);
    font-weight: var(--weight-regular);
    color: var(--text-secondary);
    text-align: right;
}

/* --- Contact --- */
.contact__text {
    font-size: var(--text-sm);
    font-weight: var(--weight-regular);
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    max-width: 28rem;
}

/* --- Footer --- */
.footer {
    padding-top: var(--space-5);
    padding-bottom: var(--space-4);
}

.footer__copy {
    font-size: var(--text-xs);
    font-weight: var(--weight-regular);
    color: var(--text-secondary);
    text-align: center;
    padding-top: var(--space-3);
}

/* --- Fade-in Animation --- */
.fade-in {
    opacity: 0;
    transform: translateY(var(--space-2));
    transition: opacity 500ms ease, transform 500ms ease;
}

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

/* --- Responsive --- */
@media (max-width: 768px) {
    .hero__headline {
        font-size: var(--text-2xl);
    }

    .hero {
        padding-top: var(--space-6);
        padding-bottom: var(--space-6);
    }

    .project-row {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-1);
    }

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

    .nav__links {
        gap: var(--space-3);
    }
}

@media (max-width: 480px) {
    .hero__headline {
        font-size: var(--text-xl);
    }

    .hero__tagline {
        font-size: var(--text-sm);
    }

    .section__heading {
        font-size: var(--text-md);
    }
}