/* Institutional Design System - CREcoin EDU */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Space+Grotesk:wght@400;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --bg-black: #0a0a0a;
    --text-white: #ffffff;
    --soft-gold: #C1A67B;
    --silver-grey: #A0AAB2;
    --slate-grey: #828B93;
    --muted-sage: #798C7C;
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.08);
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--bg-black);
    color: var(--text-white);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Glassmorphism / Institutional Cards */
.glass {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(10px);
    border-radius: 4px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-decoration: none;
    border-radius: 2px;
}

.btn-gold {
    background-color: var(--soft-gold);
    color: var(--bg-black);
}

.btn-gold:hover {
    background-color: var(--text-white);
}

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

.btn-outline:hover {
    border-color: var(--soft-gold);
    color: var(--soft-gold);
}

/* Header & Nav */
header {
    border-bottom: 1px solid var(--card-border);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-link {
    color: var(--silver-grey);
    text-decoration: none;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-left: 2rem;
    transition: color 0.3s ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--soft-gold);
}

/* Hero Section */
.hero-section {
    padding-top: 8rem;
    padding-bottom: 8rem;
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-size: 4.5rem;
    line-height: 1;
    margin-bottom: 2rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 3.5rem;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
}

.grid-features {
    margin-top: 10rem;
}

/* Page Content */
.page-content {
    padding-top: 6rem;
    padding-bottom: 10rem;
}

.page-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

/* Track Cards */
.grid-tracks {
    gap: 1.5rem;
}

.track-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 3rem;
}

.track-info {
    flex: 1;
}

.track-desc {
    max-width: 500px;
}

.track-progress-display {
    width: 240px;
    text-align: right;
}

/* Track Page Layout */
.track-page-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 4rem;
    padding-top: 6rem;
    padding-bottom: 10rem;
}

.track-main-content {
    flex: 1;
}

.track-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.track-intro {
    font-size: 1.15rem;
    margin-bottom: 3.5rem;
    color: var(--silver-grey);
    max-width: 700px;
}

.lesson-list {
    border-radius: 4px;
    overflow: hidden;
}

.lesson-item {
    padding: 1.75rem;
    border-bottom: 1px solid var(--card-border);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-decoration: none;
    color: inherit;
}

.lesson-item:last-child {
    border-bottom: none;
}

.lesson-item:hover {
    background: rgba(255, 255, 255, 0.03);
    padding-left: 2rem;
}

.lesson-item.completed {
    border-left: 3px solid var(--muted-sage);
}

.status-icon {
    color: var(--muted-sage);
}

.track-sidebar {
    position: sticky;
    top: 120px;
    height: fit-content;
}

.certification-card {
    text-align: left;
}

.cert-btn {
    width: 100%;
}

.cert-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Lesson Layout */
.lesson-container {
    max-width: 800px;
    padding-top: 6rem;
    padding-bottom: 10rem;
}

.lesson-title {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 2rem;
}

.comparison-card {
    background: rgba(193, 166, 123, 0.05);
    border: 1px solid var(--card-border);
    padding: 2rem;
    border-radius: 4px;
    margin-bottom: 3rem;
}

.insight-box {
    border-left: 3px solid var(--soft-gold);
    padding: 1.5rem 2rem;
    background: rgba(255, 255, 255, 0.02);
    margin: 3rem 0;
    font-style: italic;
    color: var(--silver-grey);
    font-size: 1.1rem;
    line-height: 1.6;
}

/* Typography Helpers */
.text-gold { color: var(--soft-gold); }
.text-silver { color: var(--silver-grey); }
.text-muted { color: var(--slate-grey); }

/* Progress Bars */
.progress-container {
    width: 100%;
    height: 4px;
    background: var(--card-border);
    margin-top: 0.5rem;
}

.progress-bar {
    height: 100%;
    background: var(--soft-gold);
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Quiz Styling */
.quiz-option {
    display: block;
    padding: 1rem;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.quiz-option:hover {
    border-color: var(--silver-grey);
}

.quiz-option.correct {
    border-color: var(--muted-sage);
    background: rgba(121, 140, 124, 0.1);
}

.quiz-option.incorrect {
    border-color: #8C7979;
    background: rgba(140, 121, 121, 0.1);
}

input[type="radio"] {
    margin-right: 0.75rem;
    accent-color: var(--soft-gold);
}

/* Spacing Utilities */
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }
.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; }

.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

/* Vertical Rhythm & Typography Refinements */
p {
    margin-bottom: 1.5rem;
    color: var(--silver-grey);
    font-size: 1rem;
    line-height: 1.7;
}

section {
    margin-bottom: 4rem;
}

h1 { font-size: 3rem; line-height: 1.1; margin-bottom: 2rem; }
h2 { font-size: 2rem; line-height: 1.2; margin-bottom: 1.5rem; }
h3 { font-size: 1.5rem; line-height: 1.3; margin-bottom: 1.25rem; }
h4 { font-size: 0.875rem; line-height: 1.4; margin-bottom: 1rem; text-transform: uppercase; letter-spacing: 0.05em; }

.font-mono { font-family: var(--font-mono); }
.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.875rem; }
.tracking-widest { letter-spacing: 0.15em; }
.uppercase { text-transform: uppercase; }

/* Grid System */
.grid {
    display: grid;
    gap: 2rem;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 768px) {
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.75rem; }
}

/* Institutional List */
ul {
    margin-bottom: 1.5rem;
    list-style: none;
}

li {
    margin-bottom: 0.75rem;
    position: relative;
    padding-left: 1.5rem;
    color: var(--silver-grey);
}

li::before {
    content: "●";
    position: absolute;
    left: 0;
    color: var(--soft-gold);
    font-size: 0.7rem;
    top: 0.2rem;
}