/* monopole.systems - Flat-Design Deep-Ocean Systems */
/* Colors: #C06060, #90A8B8, #D0E0E8, #1A2A40, #2A4060, #0C1828, #60E0C0, #40A0B0 */
/* Fonts: Red Hat Display, Red Hat Text, Red Hat Mono */

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

html {
    scroll-behavior: smooth;
}

body {
    background: #0C1828;
    color: #D0E0E8;
    font-family: 'Red Hat Text', sans-serif;
    overflow-x: hidden;
}

/* Header */
#systems-header {
    text-align: center;
    padding: 4rem 2rem 2rem;
    opacity: 0;
    animation: fadeIn 1s ease forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

.header-title {
    font-family: 'Red Hat Display', sans-serif;
    font-weight: 700;
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: 0.01em;
    color: #D0E0E8;
}

.header-sub {
    font-family: 'Red Hat Text', sans-serif;
    font-size: 0.9rem;
    color: #90A8B8;
    margin-top: 0.5rem;
}

/* Timeline */
#timeline {
    max-width: 1000px;
    margin: 0 auto;
    padding: 3rem 2rem 6rem;
    position: relative;
}

.timeline-spine {
    position: absolute;
    left: 50%;
    top: 0;
    width: 1px;
    height: 0;
    background: rgba(42, 64, 96, 0.4);
    transform: translateX(-50%);
    animation: spineGrow 2s ease forwards;
}

@keyframes spineGrow {
    to { height: 100%; }
}

/* Timeline Entries */
.timeline-entry {
    display: grid;
    grid-template-columns: 1fr 40px 1fr;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(15px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.timeline-entry.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-entry.left .entry-panel {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
    padding-right: 2rem;
}

.timeline-entry.left .entry-connector {
    grid-column: 2;
    grid-row: 1;
}

.timeline-entry.right .entry-panel {
    grid-column: 3;
    grid-row: 1;
    padding-left: 2rem;
}

.timeline-entry.right .entry-connector {
    grid-column: 2;
    grid-row: 1;
}

/* Connector + Node */
.entry-connector {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.entry-connector::before {
    content: '';
    position: absolute;
    top: 50%;
    width: 100%;
    height: 1px;
    background: rgba(42, 64, 96, 0.4);
}

.entry-node {
    width: 12px;
    height: 12px;
    background: #40A0B0;
    position: relative;
    z-index: 2;
}

.entry-node.major {
    width: 16px;
    height: 16px;
    background: #60E0C0;
}

/* Flat shapes - no border-radius */
[data-type="circle"] .entry-node { border-radius: 50%; }
[data-type="circle"] .entry-node.major { border-radius: 50%; }

/* Entry Panel - flat, no shadows, no border-radius */
.entry-panel {
    background: #1A2A40;
    border: 1px solid #2A4060;
    padding: 1.5rem;
    transition: transform 0.2s ease;
}

.entry-panel:hover {
    transform: scale(1.02);
}

.entry-date {
    font-family: 'Red Hat Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    color: #40A0B0;
    display: block;
    margin-bottom: 0.5rem;
}

.entry-title {
    font-family: 'Red Hat Display', sans-serif;
    font-weight: 700;
    font-size: clamp(1.3rem, 2.5vw, 2rem);
    letter-spacing: 0.01em;
    color: #D0E0E8;
    margin-bottom: 0.75rem;
}

.entry-body {
    font-family: 'Red Hat Text', sans-serif;
    font-size: 0.9rem;
    line-height: 1.75;
    font-weight: 400;
    color: #90A8B8;
    margin-bottom: 0.75rem;
}

.entry-category {
    font-family: 'Red Hat Mono', monospace;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #C06060;
    border: 1px solid #C06060;
    padding: 0.15rem 0.5rem;
    display: inline-block;
}

/* Responsive */
@media (max-width: 768px) {
    .timeline-entry {
        grid-template-columns: 40px 1fr;
    }

    .timeline-entry.left .entry-panel,
    .timeline-entry.right .entry-panel {
        grid-column: 2;
        grid-row: 1;
        text-align: left;
        padding-left: 1.5rem;
        padding-right: 0;
    }

    .timeline-entry.left .entry-connector,
    .timeline-entry.right .entry-connector {
        grid-column: 1;
    }

    .timeline-spine {
        left: 20px;
    }
}