/* Overall tighter rhythm */

section {
    margin-bottom: 1.4rem;
}

.content-block {
    padding: 0.75rem 0.9rem;
    border-radius: 0.9rem;
}

p {
    margin-bottom: 0.45rem;
}

ul.clean-list li {
    margin-bottom: 0.28rem;
}

/* Hero area */

.collab-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1.3fr);
    gap: 1rem;
    align-items: stretch;
    margin-bottom: 1.6rem;
}

@media (max-width: 900px) {
    .collab-hero {
        grid-template-columns: minmax(0, 1fr);
    }
}

.collab-hero-main {
    background: var(--card);
    border-radius: 1rem;
    border: 1px solid var(--border-soft);
    padding: 0.9rem 1rem;
    box-shadow: var(--shadow-soft);
    position: relative;
    overflow: hidden;
}

.collab-hero-main::before {
    content: "";
    position: absolute;
    inset: -40%;
    background:
        radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.18), transparent 55%),
        radial-gradient(circle at 100% 0, rgba(234, 179, 8, 0.18), transparent 55%),
        radial-gradient(circle at 50% 100%, rgba(124, 58, 237, 0.18), transparent 60%);
    opacity: 0.6;
    pointer-events: none;
}

.collab-hero-inner {
    position: relative;
    z-index: 1;
}

.collab-badge-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.45rem;
    font-size: 0.78rem;
}

.collab-badge {
    padding: 0.18rem 0.7rem;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.7);
    background: rgba(15, 23, 42, 0.92);
    color: #e5e7eb;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.collab-badge span.icon {
    font-size: 0.88rem;
}

.collab-hero-title {
    font-size: 1.15rem;
    margin-bottom: 0.25rem;
    color: var(--text-main);
}

.collab-hero-title span {
    background: linear-gradient(120deg, #38bdf8, #a855f7);
    -webkit-background-clip: text;
    color: transparent;
}

.collab-hero-text {
    font-size: 0.9rem;
    color: var(--text-soft);
    max-width: 32rem;
}

.collab-hero-footnote {
    font-size: 0.78rem;
    margin-top: 0.45rem;
    color: var(--text-soft);
}

.collab-hero-side {
    background: var(--card);
    border-radius: 1rem;
    border: 1px solid var(--border-soft);
    padding: 0.85rem 0.95rem;
    box-shadow: var(--shadow-soft);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.86rem;
}

.mini-heading {
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-soft);
    margin-bottom: 0.3rem;
}

.dept-chip-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
}

.dept-chip {
    padding: 0.18rem 0.65rem;
    border-radius: 999px;
    border: 1px solid rgba(148, 163, 184, 0.7);
    font-size: 0.76rem;
    background: rgba(148, 163, 184, 0.08);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.dept-dot {
    width: 6px;
    height: 6px;
    border-radius: 999px;
    display: inline-block;
}

.dot-phys {
    background: #f97316;
}

.dot-cs {
    background: #22c55e;
}

.dot-stat {
    background: #38bdf8;
}

.dot-eng {
    background: #eab308;
}

.dot-econ {
    background: #a855f7;
}

/* Main layout */

.collab-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1.1fr);
    gap: 1rem;
    align-items: flex-start;
}

@media (max-width: 900px) {
    .collab-layout {
        grid-template-columns: minmax(0, 1fr);
    }
}

/* Idea cards */

.idea-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.45rem;
    margin-top: 0.55rem;
    font-size: 0.82rem;
}

@media (max-width: 720px) {
    .idea-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

.idea-card {
    border-radius: 0.8rem;
    border: 1px solid var(--border-soft);
    padding: 0.5rem 0.6rem;
    background: radial-gradient(circle at top, rgba(148, 163, 184, 0.12), transparent 60%);
}

.idea-title {
    font-size: 0.86rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
    color: var(--text-main);
}

.idea-tagline {
    font-size: 0.75rem;
    color: var(--text-soft);
    margin-bottom: 0.2rem;
}

.future-strip {
    margin-top: 0.45rem;
    padding: 0.55rem 0.6rem;
    border-radius: 0.8rem;
    border: 1px solid rgba(56, 189, 248, 0.5);
    background: rgba(56, 189, 248, 0.06);
    font-size: 0.8rem;
    color: var(--text-soft);
}

/* Propose-a-collaboration form */

.collab-form-card {
    margin-top: 0.8rem;
    border-radius: 1rem;
    border: 1px solid var(--border-soft);
    background:
        radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 60%),
        radial-gradient(circle at bottom right, rgba(168, 85, 247, 0.16), transparent 60%),
        var(--card);
    box-shadow: var(--shadow-soft);
    padding: 0.85rem 0.95rem 0.95rem;
    position: relative;
    overflow: hidden;
    font-size: 0.88rem;
}

.collab-form-header {
    display: flex;
    justify-content: space-between;
    gap: 0.6rem;
    align-items: baseline;
    margin-bottom: 0.3rem;
}

.collab-form-title {
    font-size: 0.98rem;
    font-weight: 600;
    color: var(--text-main);
}

.collab-form-status-pill {
    font-size: 0.73rem;
    padding: 0.18rem 0.6rem;
    border-radius: 999px;
    border: 1px dashed rgba(56, 189, 248, 0.7);
    background: rgba(56, 189, 248, 0.08);
    color: var(--text-soft);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    white-space: nowrap;
}

.collab-form-status-pill span.dot {
    width: 7px;
    height: 7px;
    border-radius: 999px;
    background: #38bdf8;
    display: inline-block;
}

.collab-form-subtitle {
    font-size: 0.8rem;
    color: var(--text-soft);
    margin-bottom: 0.55rem;
}

.collab-form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.55rem;
}

@media (max-width: 720px) {
    .collab-form-grid {
        grid-template-columns: minmax(0, 1fr);
    }
}

.collab-field {
    display: flex;
    flex-direction: column;
    gap: 0.18rem;
}

.collab-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-main);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.collab-label span.hint {
    font-weight: 400;
    font-size: 0.72rem;
    color: var(--text-soft);
}

.collab-form-card input[type="text"],
.collab-form-card input[type="email"],
.collab-form-card input[type="tel"],
.collab-form-card textarea,
.collab-form-card select {
    border-radius: 0.7rem;
    border: 1px solid var(--border-soft);
    padding: 0.35rem 0.55rem;
    font-size: 0.8rem;
    font-family: inherit;
    background: rgba(255, 255, 255, 0.9);
}

body.theme-dark .collab-form-card input[type="text"],
body.theme-dark .collab-form-card input[type="email"],
body.theme-dark .collab-form-card input[type="tel"],
body.theme-dark .collab-form-card textarea,
body.theme-dark .collab-form-card select {
    background: rgba(15, 23, 42, 0.9);
}

.collab-form-card textarea {
    min-height: 70px;
    resize: vertical;
}

.collab-form-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.6rem;
    flex-wrap: wrap;
}

.collab-submit {
    border-radius: 999px;
    padding: 0.42rem 0.85rem;
    border: 1px solid rgba(148, 163, 184, 0.8);
    background: linear-gradient(120deg, #38bdf8, #0ea5e9);
    color: #012a3a;
    font-size: 0.82rem;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    box-shadow: 0 7px 15px rgba(56, 189, 248, 0.4);
}

.collab-submit span.icon {
    font-size: 0.9rem;
}

.collab-footnote {
    font-size: 0.75rem;
    color: var(--text-soft);
    max-width: 18rem;
}

/* Collaboration log */

.activity-log-card {
    border-radius: 1rem;
    border: 1px dashed var(--border-soft);
    padding: 0.75rem 0.85rem;
    background: rgba(148, 163, 184, 0.03);
    font-size: 0.82rem;
}

.activity-log-list {
    margin-top: 0.45rem;
}

.activity-log-list li {
    margin-bottom: 0.3rem;
}