.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 999px;
    padding: 0.8rem 1.15rem;
    font-weight: 700;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    line-height: 1;
}

.btn:hover {
    text-decoration: none;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-primary-dark);
}

.btn-secondary {
    background: white;
    color: var(--color-secondary);
    border-color: var(--color-border);
}

.btn-small {
    padding: 0.55rem 0.85rem;
    font-size: 0.9rem;
}

.btn-full {
    width: 100%;
}

.card,
.dashboard-card,
.auth-card,
.form-card,
.profile-main-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card,
.dashboard-card {
    padding: 1.4rem;
}

.card h2,
.card h3,
.dashboard-card h2 {
    margin-top: 0;
}

.badge,
.tag {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    background: var(--color-surface-soft);
    color: var(--color-secondary);
    font-size: 0.82rem;
    font-weight: 700;
    padding: 0.3rem 0.65rem;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.alert {
    border-radius: var(--radius-md);
    padding: 0.9rem 1rem;
    border: 1px solid var(--color-border);
    background: white;
}

.alert-success {
    border-color: rgba(22, 163, 74, 0.3);
    color: var(--color-success);
}

.auth-wrapper,
.form-page {
    max-width: 720px;
    margin: 0 auto;
    padding: 3rem 1rem;
}

.auth-card,
.form-card {
    padding: 2rem;
}

.auth-card.wide {
    max-width: 760px;
}

.auth-note {
    margin-top: 1.2rem;
    color: var(--color-muted);
}

.profile-header {
    max-width: var(--container);
    margin: 0 auto;
    padding: 2rem 1rem 0;
}

.profile-cover {
    height: 180px;
    background: linear-gradient(135deg, #dbeafe, #ffedd5);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.profile-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-main-card {
    margin: -3rem 1rem 0;
    padding: 1.5rem;
    display: flex;
    gap: 1rem;
    align-items: center;
    position: relative;
}

.avatar {
    width: 92px;
    height: 92px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    display: grid;
    place-items: center;
    font-size: 2rem;
    font-weight: 800;
    overflow: hidden;
    border: 4px solid white;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-headline {
    color: var(--color-muted);
}

.mini-list {
    display: grid;
    gap: 0.75rem;
}

.mini-list-item {
    border-top: 1px solid var(--color-border);
    padding-top: 0.75rem;
}

.directory-header {
    max-width: var(--container);
    margin: 0 auto;
    padding: 3rem 1rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 1rem;
}

.directory-header h1 {
    font-size: clamp(2rem, 5vw, 3.4rem);
    line-height: 1.05;
    margin: 0 0 0.75rem;
    letter-spacing: -0.04em;
}

.directory-header p {
    color: var(--color-muted);
    max-width: 680px;
}

.community-card {
    overflow: hidden;
    padding: 0;
}

.community-card-image {
    height: 140px;
    background: linear-gradient(135deg, #dbeafe, #ffedd5);
}

.community-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.community-placeholder {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-primary);
}

.community-card-body {
    padding: 1.25rem;
}

.community-card h3 {
    margin: 0.75rem 0 0.3rem;
}

.community-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    color: var(--color-muted);
    font-size: 0.9rem;
}

.community-meta span {
    background: var(--color-surface-soft);
    border-radius: 999px;
    padding: 0.25rem 0.6rem;
}

.community-hero {
    max-width: var(--container);
    margin: 0 auto;
    padding: 2rem 1rem 0;
}

.community-banner {
    height: 220px;
    background: linear-gradient(135deg, #dbeafe, #ffedd5);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.community-banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.community-header-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    margin: -3rem 1rem 0;
    padding: 1.5rem;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1rem;
    align-items: center;
    position: relative;
}

.community-avatar {
    width: 96px;
    height: 96px;
    border-radius: var(--radius-lg);
    background: var(--color-primary);
    color: white;
    display: grid;
    place-items: center;
    font-size: 2.2rem;
    font-weight: 900;
    overflow: hidden;
    border: 4px solid white;
}

.community-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.community-header-content h1 {
    margin: 0 0 0.5rem;
}

.community-header-content p {
    color: var(--color-muted);
}

.community-actions {
    display: flex;
    justify-content: flex-end;
}

.tab-row {
    display: flex;
    overflow-x: auto;
    gap: 0.5rem;
    padding-bottom: 0.25rem;
}

.tab-row a {
    white-space: nowrap;
    padding: 0.65rem 0.9rem;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: white;
    color: var(--color-secondary);
    font-weight: 700;
}

.tab-row a.active {
    background: var(--color-secondary);
    color: white;
}

.school-card {
    overflow: hidden;
    padding: 0;
}

.school-card-image {
    height: 140px;
    background: linear-gradient(135deg, #ede9fe, #dbeafe);
}

.school-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.school-placeholder {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    font-size: 3rem;
    font-weight: 900;
    color: #7c3aed;
}

.school-card-body {
    padding: 1.25rem;
}

.school-card h3 {
    margin: 0.75rem 0 0.3rem;
}

.school-banner {
    background: linear-gradient(135deg, #ede9fe, #dbeafe);
}

.school-avatar {
    background: #7c3aed;
}

.creator-header {
    background: linear-gradient(135deg, #f5f3ff, #eff6ff);
}

.feed-layout {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(280px, 0.8fr);
    gap: 1rem;
    align-items: start;
}

.feed-main,
.feed-side,
.feed-stack,
.comment-stack {
    display: grid;
    gap: 1rem;
}

.post-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 1.25rem;
}

.post-header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-start;
}

.post-author {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.post-author p {
    margin: 0;
    color: var(--color-muted);
    font-size: 0.9rem;
}

.post-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: white;
    display: grid;
    place-items: center;
    font-weight: 800;
    overflow: hidden;
    flex-shrink: 0;
}

.post-avatar.small {
    width: 38px;
    height: 38px;
}

.post-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.post-body {
    margin: 1rem 0;
}

.post-body p {
    margin-bottom: 0;
}

.post-actions {
    border-top: 1px solid var(--color-border);
    padding-top: 0.85rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
}

.post-action-button {
    border: 1px solid var(--color-border);
    background: white;
    border-radius: 999px;
    padding: 0.45rem 0.75rem;
    cursor: pointer;
    font-weight: 700;
    color: var(--color-secondary);
}

.post-action-link {
    border: 1px solid var(--color-border);
    background: white;
    border-radius: 999px;
    padding: 0.45rem 0.75rem;
    font-weight: 700;
    color: var(--color-secondary);
}

.post-composer h2 {
    margin-top: 0;
}

.comment-card {
    border-top: 1px solid var(--color-border);
    padding-top: 1rem;
}

.thread-stack {
    display: grid;
    gap: 0.75rem;
}

.thread-card {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: center;
    background: white;
}

.thread-card h3 {
    margin: 0.5rem 0 0.2rem;
}

.thread-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin: 0.75rem 0;
}

.thread-stats {
    display: grid;
    gap: 0.35rem;
    color: var(--color-muted);
    font-size: 0.9rem;
    min-width: 110px;
    text-align: right;
}

.discussion-post .post-body {
    margin-top: 1rem;
}

.solution-card {
    border-color: rgba(22, 163, 74, 0.35);
    background: #f0fdf4;
}

.solution-reply {
    border-color: rgba(22, 163, 74, 0.35);
    background: #f0fdf4;
    border-radius: var(--radius-md);
    padding: 1rem;
}

.notification-nav-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.notification-badge,
.mobile-notification-dot {
    min-width: 1.25rem;
    height: 1.25rem;
    border-radius: 999px;
    background: var(--color-accent);
    color: white;
    font-size: 0.72rem;
    font-weight: 800;
    display: inline-grid;
    place-items: center;
    padding: 0 0.3rem;
}

.notification-stack {
    display: grid;
    gap: 0.85rem;
}

.notification-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.15rem;
    box-shadow: var(--shadow-sm);
}

.notification-card.unread {
    border-color: rgba(249, 115, 22, 0.45);
    background: #fff7ed;
}

.notification-card h2 {
    margin: 0 0 0.35rem;
    font-size: 1.05rem;
}

.notification-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.course-card {
    overflow: hidden;
    padding: 0;
}

.course-card-image {
    height: 150px;
    background: linear-gradient(135deg, #dbeafe, #dcfce7);
}

.course-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-placeholder {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-primary);
}

.course-card-body {
    padding: 1.25rem;
}

.course-card h3 {
    margin: 0.75rem 0 0.3rem;
}

.course-hero {
    max-width: var(--container);
    margin: 0 auto;
    padding: 3rem 1rem 1rem;
}

.course-hero-card {
    background: linear-gradient(135deg, #eff6ff, #f0fdf4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: grid;
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 1.5rem;
    align-items: center;
}

.course-hero-card h1 {
    font-size: clamp(2rem, 5vw, 3.8rem);
    line-height: 1.05;
    letter-spacing: -0.045em;
    margin: 0 0 1rem;
}

.course-subtitle {
    color: var(--color-muted);
    font-size: 1.08rem;
}

.course-action-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.course-module-stack {
    display: grid;
    gap: 1rem;
}

.course-module {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    background: white;
}

.course-module h3 {
    margin-top: 0;
}

.lesson-list {
    display: grid;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.lesson-row {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.75rem;
    background: var(--color-surface-soft);
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: center;
    color: var(--color-secondary);
    font-weight: 700;
}

.lesson-row:hover {
    text-decoration: none;
    background: white;
}

.lesson-content-card {
    font-size: 1.02rem;
}

.lesson-body {
    margin-top: 1rem;
}

.resource-card {
    overflow: hidden;
    padding: 0;
}

.resource-card-image {
    height: 150px;
    background: linear-gradient(135deg, #ffedd5, #fef9c3);
}

.resource-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.resource-placeholder {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    font-size: 3rem;
    font-weight: 900;
    color: var(--color-accent);
}

.resource-card-body {
    padding: 1.25rem;
}

.resource-card h3 {
    margin: 0.75rem 0 0.3rem;
}

.resource-hero-card {
    background: linear-gradient(135deg, #fff7ed, #fef9c3);
}

.certificate-mini-card h2 {
    margin-top: 0.4rem;
}

.certificate-page {
    max-width: 1000px;
    margin: 0 auto;
    padding: 3rem 1rem;
}

.certificate-frame {
    background: linear-gradient(135deg, #eff6ff, #fff7ed);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.2rem;
    box-shadow: var(--shadow-md);
}

.certificate-inner {
    background: white;
    border: 4px solid var(--color-primary);
    border-radius: var(--radius-lg);
    padding: clamp(2rem, 6vw, 4rem);
    text-align: center;
}

.certificate-eyebrow {
    display: inline-block;
    color: var(--color-accent);
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.certificate-inner h1 {
    font-size: clamp(2rem, 5vw, 4rem);
    margin: 0 0 1.5rem;
    letter-spacing: -0.04em;
}

.certificate-presented {
    color: var(--color-muted);
    margin-bottom: 0.5rem;
}

.certificate-inner h2 {
    font-size: clamp(1.8rem, 4vw, 3rem);
    margin: 0 0 1rem;
}

.certificate-body {
    max-width: 720px;
    margin: 1rem auto;
    color: var(--color-muted);
}

.certificate-inner h3 {
    font-size: clamp(1.4rem, 3vw, 2.2rem);
    margin: 1.5rem 0;
}

.certificate-meta-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    margin: 2rem 0;
    text-align: left;
}

.certificate-meta-grid div {
    background: var(--color-surface-soft);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.certificate-meta-grid p {
    margin: 0.25rem 0 0;
    color: var(--color-muted);
}

.certificate-verification {
    background: #f8fafc;
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin: 1rem 0;
}

.certificate-verification code {
    word-break: break-word;
}

.certificate-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.valid-certificate {
    border-color: rgba(22, 163, 74, 0.35);
    background: #f0fdf4;
}

.invalid-certificate {
    border-color: rgba(220, 38, 38, 0.35);
    background: #fef2f2;
}

.study-group-card {
    overflow: hidden;
    padding: 0;
}

.study-group-card-image {
    height: 150px;
    background: linear-gradient(135deg, #ecfeff, #dcfce7);
}

.study-group-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.study-group-placeholder {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    font-size: 3rem;
    font-weight: 900;
    color: #0891b2;
}

.study-group-card-body {
    padding: 1.25rem;
}

.study-group-card h3 {
    margin: 0.75rem 0 0.3rem;
}

.study-group-banner {
    background: linear-gradient(135deg, #ecfeff, #dcfce7);
}

.study-group-avatar {
    background: #0891b2;
}

.project-card {
    overflow: hidden;
    padding: 0;
}

.project-card-image {
    height: 150px;
    background: linear-gradient(135deg, #f5f3ff, #ecfeff);
}

.project-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
    font-size: 3rem;
    font-weight: 900;
    color: #7c3aed;
}

.project-card-body {
    padding: 1.25rem;
}

.project-card h3 {
    margin: 0.75rem 0 0.3rem;
}

.project-banner {
    background: linear-gradient(135deg, #f5f3ff, #ecfeff);
}

.project-avatar {
    background: #7c3aed;
}

.event-stack {
    display: grid;
    gap: 1rem;
}

.event-card {
    display: grid;
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 1rem;
    align-items: stretch;
    padding: 1rem;
}

.event-date-box {
    background: linear-gradient(135deg, #fee2e2, #fff7ed);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    display: grid;
    place-items: center;
    padding: 1rem;
    text-align: center;
}

.event-date-box span {
    color: var(--color-accent);
    font-weight: 800;
    text-transform: uppercase;
}

.event-date-box strong {
    font-size: 2.2rem;
    line-height: 1;
}

.event-date-box small {
    color: var(--color-muted);
}

.event-card-body h3 {
    margin: 0.75rem 0 0.3rem;
}

.event-hero-card {
    background: linear-gradient(135deg, #fff7ed, #fee2e2);
}