/* index.css */
/* Hero Section */
.hero {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(560px, 0.95fr);
    align-items: center;
    gap: 32px;
    padding: 42px 44px;
    border-radius: var(--radius-xl);
    margin-bottom: 32px;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-800));
    color: white;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    opacity: 0.1;
    pointer-events: none;
    background-image: 
        radial-gradient(circle at 20% 50%, white 1px, transparent 1px),
        radial-gradient(circle at 80% 50%, white 1px, transparent 1px);
    background-size: 40px 40px;
    animation: moveBg 20s linear infinite;
}

@keyframes moveBg {
    0% { transform: translateY(0); }
    100% { transform: translateY(-40px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    min-width: 0;
    max-width: 640px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    padding: 8px 16px;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 24px;
    border: 1px solid rgba(255,255,255,0.2);
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.1;
}

.hero-content > p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: 32px;
    max-width: 34rem;
}

.hero-search {
    position: relative;
    display: flex;
    gap: 12px;
    max-width: 540px;
    transition: transform 0.2s ease;
}

.hero-search-icon {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-tertiary);
    width: 20px;
    height: 20px;
    pointer-events: none;
    z-index: 1;
}

.hero-search input {
    flex: 1;
    padding: 16px 20px 16px 52px;
    border-radius: var(--radius-lg);
    border: none;
    font-size: 1rem;
    background: white;
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
}

.hero-search input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255,255,255,0.3);
}

.hero-search .btn {
    padding: 16px 28px;
    box-shadow: var(--shadow-lg);
}

.deadline-hero-panel {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: minmax(280px, 1fr) minmax(220px, 0.75fr);
    align-items: stretch;
    gap: 14px;
    min-width: 0;
}

.deadline-board {
    position: relative;
    z-index: 1;
    width: 100%;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-self: stretch;
    background: linear-gradient(180deg, rgba(10, 24, 44, 0.28), rgba(10, 24, 44, 0.4));
    backdrop-filter: blur(16px);
    padding: 18px;
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255,255,255,0.18);
    box-shadow: 0 24px 60px rgba(8, 15, 30, 0.18);
    cursor: pointer;
}

.deadline-mini-calendar {
    position: relative;
    z-index: 1;
    display: flex;
    min-width: 0;
    flex-direction: column;
    gap: 10px;
    padding: 16px;
    border: 1px solid rgba(255,255,255,0.18);
    border-radius: var(--radius-xl);
    background: linear-gradient(180deg, rgba(255,255,255,0.16), rgba(255,255,255,0.1));
    backdrop-filter: blur(16px);
    box-shadow: 0 24px 60px rgba(8, 15, 30, 0.16);
}

.deadline-mini-calendar-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 10px;
}

.deadline-mini-calendar-head h2 {
    margin: 4px 0 0;
    font-size: 1rem;
    line-height: 1.15;
    text-transform: capitalize;
}

.deadline-mini-link {
    display: inline-flex;
    width: 34px;
    height: 34px;
    flex-shrink: 0;
    align-items: center;
    justify-content: center;
    border-radius: 9999px;
    color: var(--primary-700);
    background: white;
    text-decoration: none;
}

.deadline-mini-weekdays,
.deadline-mini-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 5px;
}

.deadline-mini-weekdays {
    color: rgba(255,255,255,0.76);
    font-size: 0.68rem;
    font-weight: 800;
    text-align: center;
}

.deadline-mini-day {
    position: relative;
    min-height: 34px;
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 10px;
    background: rgba(255,255,255,0.1);
    color: white;
    font: inherit;
    font-size: 0.72rem;
    font-weight: 800;
    cursor: pointer;
    transition: var(--transition);
}

.deadline-mini-day:hover,
.deadline-mini-day.selected {
    border-color: rgba(255,255,255,0.5);
    background: rgba(255,255,255,0.2);
}

.deadline-mini-day.outside {
    opacity: 0.36;
}

.deadline-mini-day.today {
    box-shadow: inset 0 0 0 2px rgba(255,255,255,0.42);
}

.deadline-mini-day.has-deadline::after {
    content: "";
    position: absolute;
    right: 5px;
    bottom: 5px;
    width: 6px;
    height: 6px;
    border-radius: 9999px;
    background: #a7f3d0;
}

.deadline-mini-day.has-overdue::after {
    background: #fecaca;
}

.deadline-mini-day.has-today::after {
    background: #fde68a;
}

.deadline-mini-day.has-urgent::after {
    background: #fed7aa;
}

.deadline-mini-details {
    min-height: 76px;
    padding: 12px;
    border: 1px solid rgba(255,255,255,0.14);
    border-radius: var(--radius-lg);
    background: rgba(255,255,255,0.1);
    font-size: 0.78rem;
}

.deadline-mini-details strong {
    display: block;
    margin-bottom: 6px;
    line-height: 1.2;
}

.deadline-mini-details a,
.deadline-mini-details span {
    display: block;
    overflow: hidden;
    color: rgba(255,255,255,0.82);
    line-height: 1.35;
    text-overflow: ellipsis;
    text-decoration: none;
    white-space: nowrap;
}

.deadline-mini-details a:hover {
    color: white;
}

.deadline-board::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(180deg, rgba(255,255,255,0.08), rgba(255,255,255,0));
    pointer-events: none;
}

.deadline-board > * {
    position: relative;
    z-index: 1;
}

.deadline-board:focus-visible {
    outline: 3px solid rgba(255, 255, 255, 0.45);
    outline-offset: 3px;
}

.deadline-board-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 10px;
}

.deadline-board-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    opacity: 0.82;
}

.deadline-board-kicker i {
    width: 14px;
    height: 14px;
}

.deadline-board-title-wrap {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.deadline-board-header h2,
.deadline-form-head h3,
.deadline-manage-card-head h3 {
    margin: 10px 0 8px;
    line-height: 1.05;
}

.deadline-board-header h2 {
    font-size: 1.05rem;
    margin: 0;
}

.deadline-manage-card-head p {
    margin: 0;
    font-size: 0.95rem;
    opacity: 0.84;
}

.deadline-board-actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
    flex-wrap: wrap;
}

.deadline-board-actions .btn {
    background: rgba(255,255,255,0.14);
    border-color: rgba(255,255,255,0.2);
    color: white;
    padding: 8px 12px;
}

.deadline-board-actions .btn.btn-primary {
    background: white;
    color: var(--primary-700);
}

.deadline-board-summary {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.deadline-summary-mini-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
}

.deadline-summary-pill {
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 18px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.deadline-summary-pill-highlight {
    background: rgba(255,255,255,0.16);
    border-color: rgba(255,255,255,0.2);
}

.deadline-summary-pill-wide {
    width: 100%;
}

.deadline-summary-label {
    display: block;
    font-size: 0.66rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0.75;
    margin-bottom: 0;
}

.deadline-summary-value {
    display: block;
    font-size: 1rem;
    font-weight: 800;
    line-height: 1.1;
}

.deadline-summary-meta {
    display: block;
    margin-top: 0;
    font-size: 0.72rem;
    opacity: 0.8;
}

.deadline-board-list,
.deadline-all-list,
.deadline-manage-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.deadline-card,
.deadline-list-item,
.deadline-manage-item {
    border-radius: var(--radius-lg);
    min-width: 0;
}

.deadline-card {
    border: 1px solid rgba(255,255,255,0.16);
    background: rgba(255,255,255,0.11);
    padding: 14px;
}

.deadline-list-item,
.deadline-manage-item {
    border: 1px solid var(--border-color);
    padding: 12px 14px;
}

.deadline-card-top,
.deadline-list-top,
.deadline-manage-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 10px;
}

.deadline-card-main {
    min-width: 0;
    flex: 1;
}

.deadline-list-badge,
.deadline-pill,
.deadline-card-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    border-radius: 9999px;
    padding: 6px 10px;
    font-size: 0.75rem;
    font-weight: 700;
    line-height: 1;
}

.deadline-pill {
    background: var(--primary-100);
    color: var(--primary-700);
}

.deadline-card-status {
    flex-shrink: 0;
    background: rgba(255,255,255,0.16);
    color: white;
}

.deadline-card-status.overdue {
    background: rgba(248, 113, 113, 0.2);
    color: #fee2e2;
}

.deadline-card-status.today {
    background: rgba(250, 204, 21, 0.2);
    color: #fef3c7;
}

.deadline-card-status.week {
    background: rgba(74, 222, 128, 0.18);
    color: #dcfce7;
}

.deadline-pill.overdue {
    background: #fee2e2;
    color: #b91c1c;
}

.deadline-pill.today {
    background: #fef3c7;
    color: #b45309;
}

.deadline-pill.week {
    background: #dcfce7;
    color: #15803d;
}

.deadline-card-time,
.deadline-list-time,
.deadline-manage-time {
    font-size: 0.76rem;
    font-weight: 700;
    opacity: 0.88;
}

.deadline-card-title,
.deadline-list-title,
.deadline-manage-title {
    font-size: 0.94rem;
    font-weight: 700;
    color: white;
    margin: 0;
    line-height: 1.3;
}

.deadline-list-title,
.deadline-manage-title {
    color: var(--text-primary);
    margin-bottom: 6px;
}

.deadline-card-meta,
.deadline-list-meta,
.deadline-manage-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 0.77rem;
    opacity: 0.86;
    margin-bottom: 0;
}

.deadline-list-meta,
.deadline-manage-meta {
    margin-bottom: 10px;
}

.deadline-list-meta,
.deadline-manage-meta {
    color: var(--text-secondary);
    opacity: 1;
}

.deadline-card-meta {
    color: rgba(255,255,255,0.78);
}

.deadline-card-desc,
.deadline-list-desc,
.deadline-manage-desc {
    font-size: 0.82rem;
    line-height: 1.45;
    margin: 0 0 10px;
    color: var(--text-secondary);
}

.deadline-card-desc {
    color: rgba(255,255,255,0.82);
}

.deadline-progress-track {
    position: relative;
    overflow: hidden;
    width: 100%;
    height: 7px;
    border-radius: 9999px;
    background: rgba(255,255,255,0.12);
}

.deadline-progress-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.deadline-progress-value {
    flex-shrink: 0;
    min-width: 38px;
    text-align: right;
    font-size: 0.72rem;
    font-weight: 700;
}

.deadline-card .deadline-progress-value {
    color: rgba(255,255,255,0.82);
}

.deadline-list-item .deadline-progress-track,
.deadline-manage-item .deadline-progress-track {
    background: var(--bg-tertiary);
}

.deadline-list-item .deadline-progress-value,
.deadline-manage-item .deadline-progress-value {
    color: var(--text-secondary);
}

.deadline-progress-fill {
    display: block;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #22c55e, #16a34a);
    box-shadow: 0 0 18px rgba(34, 197, 94, 0.35);
}

.deadline-progress-fill.safe {
    background: linear-gradient(90deg, #22c55e, #16a34a);
}

.deadline-progress-fill.warning {
    background: linear-gradient(90deg, #facc15, #eab308);
    box-shadow: 0 0 18px rgba(234, 179, 8, 0.35);
}

.deadline-progress-fill.overdue {
    background: linear-gradient(90deg, #ef4444, #b91c1c);
    box-shadow: 0 0 18px rgba(239, 68, 68, 0.35);
}

.deadline-progress-fill.danger {
    background: linear-gradient(90deg, #ef4444, #dc2626);
    box-shadow: 0 0 18px rgba(239, 68, 68, 0.35);
}

.deadline-board-empty,
.deadline-empty-state {
    border-radius: var(--radius-lg);
    padding: 18px;
    text-align: left;
    background: rgba(255,255,255,0.1);
    border: 1px dashed rgba(255,255,255,0.26);
}

.deadline-empty-state {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

.deadline-overview-top {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 16px;
}

.deadline-overview-stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
}

.deadline-overview-stat {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 14px;
}

.deadline-overview-stat strong {
    display: block;
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.deadline-overview-stat span {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.deadline-overview-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.deadline-filter-chip {
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    border-radius: 9999px;
    padding: 10px 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.deadline-filter-chip.active {
    background: var(--primary-100);
    color: var(--primary-700);
    border-color: var(--primary-200);
}

.deadline-list-item,
.deadline-manage-item {
    background: var(--bg-primary);
    border-color: var(--border-color);
}

.deadline-list-actions,
.deadline-manage-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 14px;
}

.deadline-manage-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 18px;
}

.deadline-form-card,
.deadline-manage-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 18px;
}

.deadline-form-head,
.deadline-manage-card-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 18px;
}

.deadline-field,
.deadline-toggle {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.deadline-field span,
.deadline-toggle span {
    font-size: 0.84rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.deadline-field input,
.deadline-field textarea,
.deadline-field select {
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 12px 14px;
    font: inherit;
}

.deadline-field textarea {
    resize: vertical;
    min-height: 110px;
}

.deadline-field-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.deadline-field-grid-dates {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.deadline-toggle-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin: 18px 0;
}

.deadline-toggle {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    padding: 10px 14px;
}

.deadline-toggle input {
    accent-color: var(--primary-600);
}

.deadline-form-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 22px;
}

.deadline-manage-item {
    display: flex;
    flex-direction: column;
}

.deadline-manage-top {
    align-items: flex-start;
}

.deadline-manage-actions .btn {
    padding-inline: 14px;
}

.deadline-inline-meta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* Quick Access */
.quick-access {
    margin-bottom: 32px;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.quick-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.quick-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.quick-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-300);
}

.quick-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.quick-icon i {
    width: 28px;
    height: 28px;
}

.quick-card span {
    font-weight: 600;
    font-size: 0.9375rem;
}

/* Subjects Section */
.subjects-section {
    margin-bottom: 32px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    gap: 16px;
}

.section-title-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
    flex-wrap: wrap;
}

.section-title-wrapper .section-title {
    margin-bottom: 0;
    line-height: 1.1;
}

.badge-count {
    background: var(--primary-100);
    color: var(--primary-700);
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 700;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 28px;
}

.section-header .btn {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.section-header .btn i,
.section-header .btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.subject-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 24px;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
}

.subject-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-300);
}

.subject-card.featured {
    border-color: var(--primary-400);
    box-shadow: 0 0 0 1px var(--primary-400);
}

.featured-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    padding: 4px 12px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.subject-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.subject-icon-large {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.subject-icon-large svg {
    width: 32px;
    height: 32px;
}

.subject-icon-large.math { background: #dbeafe; color: #1e40af; }
.subject-icon-large.algebra { background: #fce7f3; color: #be185d; }
.subject-icon-large.physics { background: #d1fae5; color: #047857; }
.subject-icon-large.programming { background: #ffedd5; color: #c2410c; }
.subject-icon-large.chemistry { background: #ede9fe; color: #7c3aed; }
.subject-icon-large.biology { background: #ccfbf1; color: #0d9488; }
.subject-icon-large.history { background: #fef3c7; color: #b45309; }
.subject-icon-large.geography { background: #cffafe; color: #0891b2; }
.subject-icon-large.literature { background: #ffe4e6; color: #e11d48; }
.subject-icon-large.economics { background: #e0e7ff; color: #4338ca; }
.subject-icon-large.philosophy { background: #f1f5f9; color: #475569; }
.subject-icon-large.art { background: #fae8ff; color: #c026d3; }
.subject-icon-large.music { background: #f3e8ff; color: #9333ea; }
.subject-icon-large.languages { background: #d1fae5; color: #059669; }
.subject-icon-large.psychology { background: #e0f2fe; color: #0284c7; }
.subject-icon-large.default { background: #f3f4f6; color: #6b7280; }

.subject-menu {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    border: none;
    background: none;
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.subject-card:hover .subject-menu {
    opacity: 1;
}

.subject-menu:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.subject-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.subject-card > p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 16px;
    flex: 1;
}

.subject-meta {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.subject-meta span {
    display: flex;
    align-items: center;
    gap: 6px;
}

.subject-meta i {
    width: 14px;
    height: 14px;
}

.subject-progress {
    display: flex;
    align-items: center;
    gap: 12px;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 9999px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    border-radius: 9999px;
    transition: width 0.5s ease;
}

.subject-progress span {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-600);
    white-space: nowrap;
}

/* Activity Section */
.activity-section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 24px;
}

.activity-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.activity-item:hover {
    background: var(--bg-secondary);
}

.activity-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.activity-icon i {
    width: 24px;
    height: 24px;
}

.activity-content p {
    color: var(--text-primary);
    font-size: 0.9375rem;
    margin-bottom: 4px;
}

.activity-time {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

/* Responsive */
@media (max-width: 1200px) {
    .hero {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .hero-content {
        max-width: 100%;
    }

    .deadline-board {
        width: 100%;
    }

    .deadline-hero-panel {
        grid-template-columns: minmax(0, 1fr) minmax(220px, 0.8fr);
    }

    .deadline-manage-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .quick-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-search {
        flex-direction: column;
    }

    /* Icon is positioned relative to the whole column height, so hide it on
       mobile and let the input sit flush (without left padding for the icon). */
    .hero-search-icon {
        display: none;
    }

    .hero-search input {
        padding-left: 20px;
    }

    .hero-search .btn {
        width: 100%;
    }
    
    .hero-search-dropdown {
        position: fixed !important;
        left: 10px !important;
        right: 10px !important;
        width: calc(100vw - 20px) !important;
        max-width: calc(100vw - 20px) !important;
        min-width: auto !important;
    }
    
    .deadline-board {
        padding: 20px;
    }

    .deadline-hero-panel {
        grid-template-columns: 1fr;
    }

    .deadline-board-header,
    .deadline-form-head,
    .deadline-manage-card-head {
        flex-direction: column;
        align-items: flex-start;
    }

    .deadline-field-grid,
    .deadline-field-grid-dates {
        grid-template-columns: 1fr;
    }

    .deadline-overview-stats {
        grid-template-columns: 1fr 1fr;
    }

    .deadline-board-actions,
    .deadline-form-actions {
        width: 100%;
    }

    .deadline-board-actions .btn,
    .deadline-form-actions .btn {
        flex: 1 1 180px;
    }

    .deadline-summary-mini-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .deadline-mini-calendar {
        padding: 18px;
    }
}

/* Hero Search Dropdown */
.hero-search-dropdown {
    position: fixed;
    top: auto;
    left: auto;
    right: auto;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.35);
    max-height: 450px;
    overflow-y: auto;
    z-index: 9999;
    display: none;
    border: 1px solid var(--border-color);
    min-width: 300px;
    max-width: calc(100vw - 40px);
}

.hero-search-dropdown.show {
    display: block;
    animation: dropdownFadeIn 0.2s ease;
}

@keyframes dropdownFadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.search-results-section {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.search-results-section:last-of-type {
    border-bottom: none;
}

.search-results-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    border-bottom: 1px solid var(--bg-secondary);
}

.search-results-header i,
.search-results-header svg {
    width: 14px;
    height: 14px;
}

.search-results-list {
    padding: 4px;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    margin: 2px 0;
    text-decoration: none;
    color: inherit;
}

.search-result-item:hover {
    background: var(--bg-secondary);
}

.search-result-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.search-result-icon i,
.search-result-icon svg {
    width: 18px;
    height: 18px;
}

.file-icon-pdf {
    background: #fee2e2;
    color: #dc2626;
}

.file-icon-image {
    background: #dbeafe;
    color: #2563eb;
}

.file-icon-video {
    background: #fef3c7;
    color: #d97706;
}

.file-icon-doc {
    background: #e0e7ff;
    color: #4f46e5;
}

.quiz-icon {
    background: var(--primary-100);
    color: var(--primary-600);
}

.subject-icon {
    background: #e0e7ff;
    color: #4f46e5;
}

.update-icon {
    background: #dcfce7;
    color: #15803d;
}

.search-result-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.search-result-title {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-result-title mark {
    background: var(--primary-200);
    color: var(--primary-800);
    padding: 0 2px;
    border-radius: 2px;
    font-weight: 600;
}

.search-result-subtitle {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.search-result-arrow {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    opacity: 0;
    transition: var(--transition);
}

.search-result-item:hover .search-result-arrow {
    opacity: 1;
    color: var(--primary-600);
}

.search-results-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text-tertiary);
    text-align: center;
}

.search-results-empty i {
    width: 48px;
    height: 48px;
    margin-bottom: 12px;
    opacity: 0.5;
}

.search-results-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    color: var(--text-tertiary);
    text-align: center;
}

.search-results-loading .spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-600);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 12px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ── MOBILE PATCHES (appended) ──────────────────────────────── */

@media (max-width: 768px) {
    /* Hero: reduce the large 48px padding that eats screen space */
    .hero {
        padding: 28px 24px;
    }

    /* Subjects grid: auto-fill at minmax(280px) already wraps well,
       but force single column on narrow phones */
    .subjects-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    /* Hero: even tighter on the smallest phones */
    .hero {
        padding: 20px 16px;
    }

    /* Hero h1: already 2rem at 768px (existing rule), reduce further */
    .hero h1 {
        font-size: 1.625rem;
        line-height: 1.2;
    }

    /* Hero stats: reduce internal padding */
    .deadline-board {
        padding: 16px;
    }

    .deadline-mini-calendar {
        padding: 16px;
    }

    .deadline-board-header h2 {
        font-size: 1rem;
    }

    .deadline-summary-value,
    .deadline-overview-stat strong {
        font-size: 1.1rem;
    }

    .deadline-card-top {
        flex-direction: column;
    }

    .deadline-card-status {
        align-self: flex-start;
    }

    .deadline-card,
    .deadline-list-item,
    .deadline-manage-item,
    .deadline-form-card,
    .deadline-manage-card {
        padding: 16px;
    }
}

/* Index mobile production polish */
@media (max-width: 768px) {
    .sidebar {
        width: min(86vw, var(--sidebar-width)) !important;
        max-width: min(86vw, var(--sidebar-width)) !important;
        box-shadow: 24px 0 60px rgba(15, 23, 42, 0.18);
    }

    .sidebar-overlay.active {
        background: rgba(15, 23, 42, 0.42) !important;
        backdrop-filter: blur(2px) !important;
        -webkit-backdrop-filter: blur(2px) !important;
    }

    .app-container.sidebar-collapsed .sidebar-header {
        justify-content: flex-start !important;
    }

    .app-container.sidebar-collapsed .logo-text,
    .app-container.sidebar-collapsed .nav-label,
    .app-container.sidebar-collapsed .nav-item span {
        display: inline !important;
    }

    .app-container.sidebar-collapsed .nav-label {
        display: block !important;
    }

    .app-container.sidebar-collapsed .nav-item {
        justify-content: flex-start !important;
        padding: 10px 12px !important;
    }

    .sidebar-nav {
        padding-bottom: max(20px, env(safe-area-inset-bottom));
    }

    .header-right {
        flex-shrink: 0;
        gap: 8px;
    }

    .mobile-menu-btn,
    .icon-btn {
        width: 40px;
        height: 40px;
        display: inline-flex !important;
        align-items: center;
        justify-content: center;
    }

    html[data-theme="light"] #themeToggle .light-icon,
    html[data-theme="dark"] #themeToggle .dark-icon {
        display: none !important;
    }

    .user-trigger {
        min-height: 44px;
        padding: 6px 8px;
        gap: 8px;
    }

    .user-dropdown {
        position: fixed;
        top: calc(var(--header-height) + 10px);
        right: 12px;
        width: min(280px, calc(100vw - 24px));
        min-width: 0;
        max-width: calc(100vw - 24px);
        z-index: 1000;
        border-radius: 18px;
    }

    .user-dropdown a {
        min-height: 46px;
        font-size: 0.95rem;
    }

    .hero {
        grid-template-columns: 1fr;
        align-items: stretch;
        gap: 20px;
        margin-bottom: 28px;
        border-radius: 22px;
    }

    .hero-badge {
        display: flex;
        width: 100%;
        max-width: 100%;
        align-items: flex-start;
        border-radius: 20px;
        padding: 10px 12px;
        font-size: 0.84rem;
        line-height: 1.35;
        white-space: normal;
    }

    .hero-badge span {
        min-width: 0;
        overflow-wrap: anywhere;
    }

    .hero-content > p {
        max-width: none;
        margin-bottom: 24px;
        font-size: 1rem;
        line-height: 1.55;
    }

    .hero-search {
        max-width: none;
        gap: 10px;
        transform: none !important;
    }

    .hero-search input,
    .hero-search .btn {
        min-height: 56px;
        border-radius: 16px;
    }

    .hero-search-dropdown {
        max-height: min(62dvh, 450px);
        border-radius: 18px;
    }

    .deadline-hero-panel {
        gap: 14px;
    }

    .deadline-board,
    .deadline-mini-calendar {
        border-radius: 20px;
    }

    .deadline-board-header h2 {
        line-height: 1.15;
    }

    .deadline-board-actions {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .deadline-board-actions .btn {
        min-width: 0;
        min-height: 44px;
        padding: 10px 12px;
    }

    .deadline-board-kicker {
        letter-spacing: 0.06em;
    }

    .deadline-summary-pill {
        border-radius: 16px;
        padding: 10px;
    }

    .deadline-summary-meta,
    .deadline-summary-value,
    .deadline-card-title,
    .deadline-card-meta {
        overflow-wrap: anywhere;
    }

    .deadline-mini-grid,
    .deadline-mini-weekdays {
        gap: 6px;
    }

    .deadline-mini-day {
        min-height: 36px;
        border-radius: 10px;
        padding: 0;
    }

    .deadline-mini-details {
        min-height: 0;
    }

    .section-header {
        align-items: center;
    }

    .section-header > .section-title {
        margin-bottom: 0;
        line-height: 1.1;
    }

    .section-title-wrapper {
        align-items: flex-start;
        gap: 10px;
    }

    .section-header .btn {
        min-height: 40px;
        padding-inline: 12px;
    }

    .subjects-grid {
        gap: 18px;
    }

    .subject-card {
        border-radius: 22px;
        padding: 22px;
    }

    .subject-card h3,
    .subject-card > p {
        overflow-wrap: anywhere;
    }

    .subject-meta {
        flex-wrap: wrap;
        gap: 10px 14px;
        margin-bottom: 0;
    }

    .activity-section {
        padding: 20px;
        border-radius: 22px;
    }

    .activity-section .section-header {
        margin-bottom: 16px;
    }

    .activity-list {
        gap: 10px;
    }

    .activity-item {
        align-items: flex-start;
        gap: 12px;
        padding: 12px 0;
    }

    .activity-icon {
        width: 44px;
        height: 44px;
        border-radius: 14px;
    }

    .activity-content {
        min-width: 0;
        flex: 1;
    }

    .activity-content p {
        line-height: 1.45;
        overflow-wrap: anywhere;
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: min(88vw, var(--sidebar-width)) !important;
        max-width: min(88vw, var(--sidebar-width)) !important;
    }

    .hero {
        gap: 18px;
        margin-bottom: 24px;
        border-radius: 20px;
    }

    .hero-badge {
        padding: 9px 11px;
        font-size: 0.78rem;
    }

    .hero-content > p {
        margin-bottom: 20px;
    }

    .deadline-board,
    .deadline-mini-calendar {
        padding: 14px;
    }

    .deadline-board-actions {
        grid-template-columns: 1fr;
    }

    .deadline-mini-day {
        min-height: 34px;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .subject-card,
    .activity-section {
        padding: 18px;
    }

    .activity-item {
        padding: 10px 0;
    }
}