/*
 * Tag Creative Studio — Design Tokens & Utilities
 *
 * Dark editorial theme: obsidian base, violet accent, cream text.
 * Font: DM Sans (geometric, modern — suits a creative agency).
 * To retheme: edit :root variables. All components reference these tokens.
 */

/* ── Fonts ──────────────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,700;0,9..40,800;1,9..40,300&display=swap');

/* ── Tokens ─────────────────────────────────────────────────────────────────── */
:root {
    /* Brand */
    --color-primary:        #7c3aed;
    --color-primary-hover:  #6d28d9;
    --color-primary-light:  #ede9fe;
    --color-accent:         #8b5cf6;
    --color-accent-dim:     rgba(139,92,246,.15);
    --color-gold:           #f59e0b;

    /* Text */
    --color-text:           #f7f6f2;
    --color-text-muted:     rgba(247,246,242,.5);
    --color-text-dim:       rgba(247,246,242,.25);
    --color-text-dark:      #0f0f1a;

    /* Backgrounds */
    --color-bg:             #08090f;
    --color-bg-surface:     #0f1020;
    --color-bg-raised:      #161828;
    --color-bg-light:       #f7f6f2;

    /* Borders */
    --color-border:         rgba(255,255,255,.07);
    --color-border-mid:     rgba(255,255,255,.12);
    --color-border-strong:  rgba(255,255,255,.2);

    /* Shadows */
    --shadow-sm:            0 1px 4px rgba(0,0,0,.5);
    --shadow-md:            0 4px 20px rgba(0,0,0,.6);
    --shadow-lg:            0 12px 60px rgba(0,0,0,.7);
    --shadow-violet:        0 8px 32px rgba(124,58,237,.4);

    /* Shape */
    --radius:               0.375rem;
    --radius-lg:            0.75rem;
    --radius-xl:            1.25rem;

    /* Typography */
    --font:                 'DM Sans', system-ui, -apple-system, sans-serif;

    /* Layout */
    --container:            1240px;
    --section-gap:          6rem;
}

/* ── Reset ──────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    line-height: 1.6;
}
img  { max-width: 100%; height: auto; display: block; }
a    { color: inherit; text-decoration: none; }
ul   { list-style: none; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; }

/* ── Layout utilities ────────────────────────────────────────────────────────── */
.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 2rem;
}
.section        { padding: var(--section-gap) 0; }
.section--light { background: var(--color-bg-light); color: var(--color-text-dark); }
.section--surface { background: var(--color-bg-surface); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-center  { display: flex; align-items: center; justify-content: center; gap: 1rem; }

/* ── Section header ──────────────────────────────────────────────────────────── */
.section-header         { text-align: center; margin-bottom: 3.5rem; }
.section-header .eyebrow { margin-bottom: 1rem; }
.section-header h2      { margin-bottom: 1rem; }
.section-header .lead   { max-width: 600px; margin: 0 auto; }

/* ── Typography ──────────────────────────────────────────────────────────────── */
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--color-accent);
}
.eyebrow::before {
    content: '';
    display: inline-block;
    width: 1.5rem;
    height: 1px;
    background: var(--color-accent);
    flex-shrink: 0;
}

h1 {
    font-size: clamp(3rem, 7vw, 5.5rem);
    font-weight: 800;
    line-height: 1.0;
    letter-spacing: -0.04em;
}
h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
}
h3 {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.35;
}
.lead {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--color-text-muted);
}
.text-muted  { color: var(--color-text-muted); }
.text-center { text-align: center; }

/* ── Buttons ─────────────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.9375rem;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1.5px solid transparent;
    white-space: nowrap;
    line-height: 1;
    text-decoration: none;
}
.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.btn-primary:hover {
    background: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-violet);
}
.btn-outline {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border-mid);
}
.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}
.btn-outline-light {
    background: transparent;
    color: var(--color-text-dark);
    border-color: rgba(15,15,26,.2);
}
.btn-outline-light:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}
.btn-sm  { padding: 0.5rem 1.125rem; font-size: 0.875rem; }
.btn-lg  { padding: 1.125rem 2.5rem; font-size: 1rem; }

/* ── Cards ───────────────────────────────────────────────────────────────────── */
.card-dark {
    background: var(--color-bg-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: border-color 0.2s, transform 0.2s;
}
.card-dark:hover {
    border-color: var(--color-border-mid);
    transform: translateY(-2px);
}

/* ── Nav ─────────────────────────────────────────────────────────────────────── */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(8,9,15,.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}
.nav__inner {
    height: 4.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}
.nav__wordmark {
    font-weight: 800;
    font-size: 1.0625rem;
    letter-spacing: -0.03em;
    color: var(--color-text);
    white-space: nowrap;
    flex-shrink: 0;
}
.nav__links {
    display: flex;
    align-items: center;
    gap: 2rem;
}
.nav__link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color 0.15s;
}
.nav__link:hover { color: var(--color-text); }

/* ── Blog cards ──────────────────────────────────────────────────────────────── */
.blog-card {
    background: var(--color-bg-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color 0.2s, transform 0.2s;
    display: flex;
    flex-direction: column;
}
.blog-card:hover {
    border-color: var(--color-border-mid);
    transform: translateY(-3px);
}
.blog-card__img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    background: var(--color-bg-surface);
}
.blog-card__img-placeholder {
    width: 100%;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, var(--color-bg-surface), var(--color-bg-raised));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--color-text-dim);
}
.blog-card__body {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.blog-card__meta  { font-size: 0.8125rem; color: var(--color-text-muted); margin-bottom: 0.5rem; }
.blog-card__title { font-size: 1.0625rem; font-weight: 700; line-height: 1.35; margin-bottom: 0.5rem; color: var(--color-text); }
.blog-card__excerpt { font-size: 0.9375rem; color: var(--color-text-muted); line-height: 1.6; flex: 1; margin-bottom: 1rem; }
.blog-card__link { font-size: 0.875rem; font-weight: 600; color: var(--color-accent); }
.blog-card__link:hover { text-decoration: underline; }

/* ── FAQ ─────────────────────────────────────────────────────────────────────── */
details.faq-item { border: 1px solid var(--color-border); border-radius: var(--radius); overflow: hidden; }
details.faq-item + details.faq-item { margin-top: 0.5rem; }
details.faq-item summary {
    padding: 1.25rem 1.5rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    list-style: none;
    user-select: none;
    background: var(--color-bg-raised);
    color: var(--color-text);
    transition: background 0.15s;
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after { content: '+'; font-size: 1.25rem; font-weight: 400; color: var(--color-accent); flex-shrink: 0; }
details.faq-item[open] summary::after { content: '−'; }
details.faq-item .faq-answer { padding: 0 1.5rem 1.25rem; color: var(--color-text-muted); line-height: 1.7; font-size: 0.9375rem; background: var(--color-bg-raised); }

/* ── Form ────────────────────────────────────────────────────────────────────── */
.form-group  { display: flex; flex-direction: column; gap: 0.375rem; }
.form-label  { font-size: 0.875rem; font-weight: 600; color: var(--color-text); }
.form-input, .form-textarea {
    padding: 0.875rem 1.125rem;
    border: 1.5px solid var(--color-border-mid);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: var(--font);
    color: var(--color-text);
    background: var(--color-bg-raised);
    transition: border-color 0.15s, box-shadow 0.15s;
    width: 100%;
}
.form-input::placeholder, .form-textarea::placeholder { color: var(--color-text-dim); }
.form-input:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(139,92,246,.2);
}
.form-textarea { resize: vertical; min-height: 140px; }

/* ── Discipline row (hover indent) ──────────────────────────────────────────── */
.discipline-row {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    padding: 2rem 0;
    border-bottom: 1px solid var(--color-border);
    transition: padding-left 0.25s ease;
    cursor: default;
}
.discipline-row:hover { padding-left: 1rem; }
.discipline-row:first-child { border-top: 1px solid var(--color-border); }

/* ── Skeleton ────────────────────────────────────────────────────────────────── */
.skeleton {
    background: linear-gradient(90deg, var(--color-bg-surface) 25%, var(--color-bg-raised) 50%, var(--color-bg-surface) 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite;
    border-radius: var(--radius);
}
@keyframes skeleton-shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ── Subtle page-load fade ───────────────────────────────────────────────────── */
@keyframes tag-fade-up {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}
.tag-animate { animation: tag-fade-up 0.65s ease both; }
.tag-animate-2 { animation: tag-fade-up 0.65s 0.1s ease both; }
.tag-animate-3 { animation: tag-fade-up 0.65s 0.2s ease both; }
.tag-animate-4 { animation: tag-fade-up 0.65s 0.3s ease both; }

/* ── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    :root { --section-gap: 4rem; }
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .grid-4 { grid-template-columns: 1fr 1fr; }
    .nav__links { display: none; }
    .discipline-row { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
    .discipline-row:hover { padding-left: 0; }
}
@media (max-width: 480px) {
    .grid-4 { grid-template-columns: 1fr; }
    .container { padding: 0 1.25rem; }
    h1 { font-size: clamp(2.75rem, 11vw, 3.5rem); }
}