/* ============================================================
   Responsive Styles — Mobile-First
   Breakpoints: 320 / 360 / 375 / 390 / 412 / 430 / 768 / 1024 / 1440+
   ============================================================ */

/* ===== Base mobile adjustments (≤430px) ===== */
@media (max-width: 430px) {
  html { font-size: 15px; }

  .page-container {
    padding: 12px;
    padding-bottom: calc(var(--bottom-nav-safe) + 12px);
  }

  .card-pad { padding: 16px; }

  .section-title { font-size: 12px; margin-bottom: 12px; }
}

/* ===== Small phones (≤375px) ===== */
@media (max-width: 375px) {
  html { font-size: 14px; }

  .page-container { padding: 10px; }
  .card-pad { padding: 14px; }
}

/* ===== Extra small phones (≤320px) ===== */
@media (max-width: 320px) {
  html { font-size: 13.5px; }

  .page-container { padding: 8px; }
}

/* ===== Mobile general (≤768px) ===== */
@media (max-width: 768px) {
  .page-container {
    max-width: 100%;
    padding: 16px 14px;
    padding-bottom: calc(var(--bottom-nav-safe) + 16px);
  }

  /* Hide desktop-specific chrome */
  .app-header { display: none; }
  .main-nav { display: none; }

  /* ========== TODAY 2.0 / Dashboard ========== */
  .today-layout {
    grid-template-columns: 1fr;
    gap: 14px;
    margin-bottom: 14px;
  }

  .today-main {
    gap: 10px;
    order: 1;
  }

  .today-side {
    gap: 12px;
    flex-direction: row;
    flex-wrap: wrap;
    order: 2;
  }

  .today-side > * {
    flex: 1 1 45%;
    min-width: 0;
  }

  .today-header-row {
    gap: 8px;
    margin-bottom: 0;
    min-width: 0;
  }

  .today-date-main {
    font-size: var(--text-sm);
    font-weight: 600;
  }

  .today-date-sub {
    font-size: var(--text-xs);
  }

  .today-clock {
    font-size: var(--text-md);
    font-weight: 700;
  }

  .today-clock .seconds {
    font-size: var(--text-xs);
  }

  /* Status block */
  .today-status {
    padding-left: 12px;
    border-left-width: 2px;
  }

  .status-tag {
    font-size: 9px;
    margin-bottom: 1px;
    letter-spacing: 0.06em;
  }

  .status-title {
    font-size: var(--text-lg);
    line-height: 1.25;
    -webkit-line-clamp: 2;
  }

  .status-meta {
    font-size: var(--text-xs);
    gap: 6px;
  }

  .status-section {
    font-size: 10px;
    margin-top: 0;
  }

  .status-countdown {
    margin-top: 6px;
    gap: 6px;
  }

  .countdown-text {
    font-size: 10px;
  }

  .countdown-value {
    font-size: var(--text-md);
  }

  .countdown-sec {
    font-size: 10px;
  }

  .status-progress-mini {
    margin-top: 2px;
    height: 2px;
  }

  .status-freetime-now {
    margin-top: 6px;
    padding-top: 6px;
    gap: 4px;
  }

  .ft-now-value {
    font-size: var(--text-sm);
  }

  .status-remaining {
    font-size: var(--text-xs);
    margin-top: 1px;
  }

  .status-next {
    margin-top: 8px;
    padding-top: 8px;
    font-size: 11px;
    gap: 6px;
  }

  .status-next-free {
    margin-top: 4px;
    font-size: 10px;
  }

  .status-sub {
    font-size: var(--text-xs);
    margin-top: 1px;
  }

  /* Stats row */
  .today-stats-row {
    padding: 6px 0;
  }

  .stat-inline {
    padding: 0 6px;
    gap: 1px;
  }

  .stat-inline-label {
    font-size: 8px;
    letter-spacing: 0.04em;
  }

  .stat-inline-value {
    font-size: var(--text-sm);
  }

  /* Semester */
  .today-semester {
    gap: 4px;
  }

  .semester-week-num {
    font-size: var(--text-md);
  }

  .semester-percent {
    font-size: 9px;
  }

  .semester-bar {
    height: 3px;
  }

  .semester-date {
    font-size: 9px;
  }

  /* Free time */
  .today-freetime {
    gap: 4px;
  }

  .freetime-row {
    gap: 12px;
  }

  .freetime-value {
    font-size: var(--text-sm);
  }

  /* Next class day */
  .today-next-day {
    gap: 4px;
  }

  .next-day-date {
    font-size: var(--text-md);
  }

  .next-day-info {
    font-size: var(--text-xs);
  }

  .next-day-first {
    margin-top: 3px;
    padding-top: 4px;
    font-size: var(--text-xs);
    gap: 6px;
  }

  /* Empty day section */
  .today-empty-section {
    padding: 28px 16px;
    gap: 8px;
    margin-top: 4px;
  }

  .empty-day-icon {
    width: 32px;
    height: 32px;
  }

  .empty-day-title {
    font-size: var(--text-sm);
  }

  .empty-day-sub {
    font-size: var(--text-xs);
  }

  /* Timeline */
  .today-timeline-section {
    margin-top: 2px;
  }

  .section-label-row {
    margin-bottom: 6px;
  }

  .tl-item {
    padding: 5px 0;
    gap: 10px;
  }

  .tl-time {
    width: 40px;
  }

  .tl-start {
    font-size: 11px;
  }

  .tl-end {
    font-size: 9px;
  }

  .tl-marker {
    width: 7px;
    height: 7px;
    margin-top: 3px;
  }

  .tl-name {
    font-size: var(--text-sm);
  }

  .tl-meta {
    font-size: 10px;
    gap: 3px 6px;
    margin-top: 1px;
  }

  .tl-loc {
    max-width: 110px;
  }

  .tl-item::after {
    left: 47px;
    top: 12px;
    bottom: -5px;
  }

  .tl-gap {
    padding-left: 50px;
    padding-top: 2px;
    padding-bottom: 2px;
  }

  .tl-gap-text {
    font-size: 9px;
    gap: 4px;
  }

  .tl-end {
    padding-top: 4px;
    gap: 10px;
  }

  .tl-end-marker {
    margin-left: 47px;
    width: 7px;
    height: 7px;
  }

  .tl-end-text {
    font-size: 11px;
  }

  .tl-end-time {
    font-size: 9px;
  }

  /* ========== Schedule ========== */
  .schedule-toolbar {
    gap: 10px;
    margin-bottom: 16px;
    flex-direction: column;
    align-items: stretch;
  }

  .week-nav {
    justify-content: space-between;
  }

  .week-info {
    min-width: 0;
    flex: 1;
  }

  .week-info-main { font-size: 15px; }
  .week-info-sub { font-size: 12px; }

  .search-box {
    max-width: 100%;
  }

  .search-input {
    font-size: 16px; /* prevents iOS zoom */
    padding: 10px 12px 10px 38px;
  }

  .search-icon {
    width: 20px;
    height: 20px;
    left: 10px;
  }

  /* Mobile schedule day view */
  .m-schedule-toolbar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
  }

  .m-week-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 0;
  }

  .m-week-main {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    white-space: nowrap;
  }

  .m-week-sub {
    font-size: 11px;
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
    white-space: nowrap;
  }

  .m-today-btn {
    font-size: 12px;
    font-weight: 500;
    color: var(--color-primary);
    padding: 4px 10px;
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
  }

  .m-search-toggle {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    flex-shrink: 0;
    transition: all var(--transition-fast);
  }

  .m-search-toggle:active {
    border-color: var(--color-primary);
    color: var(--color-primary);
  }

  .m-search-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
    align-items: center;
    animation: searchExpand var(--duration-normal) var(--ease-out);
  }

  @keyframes searchExpand {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .m-search-input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 16px;
    color: var(--color-text);
    background: var(--color-surface);
  }

  .m-search-input:focus { outline: none; border-color: var(--color-primary); }

  .m-search-close {
    font-size: 14px;
    color: var(--color-primary);
    padding: 4px 8px;
    flex-shrink: 0;
  }

  .m-day-picker {
    display: flex;
    gap: 4px;
    margin-bottom: 12px;
    position: sticky;
    top: var(--mobile-header-height);
    z-index: 5;
    background: var(--color-bg);
    padding: 6px 0;
  }

  .m-day-chip {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
    padding: 4px 0;
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    transition: border-color var(--duration-fast) var(--ease-out),
                background var(--duration-fast) var(--ease-out),
                color var(--duration-fast) var(--ease-out);
    min-height: 40px;
  }

  .m-day-chip:active { transform: scale(0.96); }
  .m-day-chip:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 1px; }

  .m-day-chip.today {
    border-color: var(--color-primary);
    background: var(--color-primary-tint);
    color: var(--color-primary);
  }

  .m-day-chip.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
  }

  .m-day-chip-name {
    font-size: 10px;
    font-weight: 500;
  }

  .m-day-chip-date {
    font-size: 13px;
    font-weight: 700;
    font-family: var(--font-mono);
  }

  .m-agenda {
    display: flex;
    flex-direction: column;
  }

  .m-agenda-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
    text-align: center;
  }

  .m-agenda-item {
    display: flex;
    align-items: stretch;
    gap: 10px;
    padding: 12px 0;
    cursor: pointer;
    border-bottom: 1px solid var(--color-border-light);
    transition: opacity var(--duration-fast) var(--ease-out), background var(--duration-fast) var(--ease-out);
    animation: agendaEnter var(--duration-normal) var(--ease-out);
  }

  @keyframes agendaEnter {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .m-agenda-item:active {
    background: var(--color-surface-subtle);
  }

  .m-agenda-item:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
    border-radius: var(--radius-sm);
  }

  .m-agenda-item.finished {
    opacity: 0.45;
  }

  .m-agenda-item.in-progress {
    opacity: 1;
  }

  .m-agenda-time {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    width: 42px;
    flex-shrink: 0;
    padding-top: 2px;
  }

  .m-agenda-start {
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--color-text);
    font-variant-numeric: tabular-nums;
    line-height: 1.2;
  }

  .m-agenda-end {
    font-size: 10px;
    font-family: var(--font-mono);
    color: var(--color-text-tertiary);
    font-variant-numeric: tabular-nums;
    line-height: 1.2;
  }

  .m-agenda-dot {
    width: 8px;
    border-left: 2px solid var(--color-border);
    margin: 2px 0;
    flex-shrink: 0;
  }

  .m-agenda-item.in-progress .m-agenda-dot {
    border-left-color: var(--color-primary);
    width: 8px;
  }

  .m-agenda-item.finished .m-agenda-dot {
    border-left-color: var(--color-text-tertiary);
  }

  .m-agenda-body {
    flex: 1;
    min-width: 0;
  }

  .m-agenda-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
  }

  .m-agenda-item.in-progress .m-agenda-name {
    color: var(--color-primary);
  }

  .m-agenda-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 8px;
    margin-top: 3px;
    font-size: 11px;
    color: var(--color-text-secondary);
  }

  .m-agenda-section {
    font-family: var(--font-mono);
    color: var(--color-text);
    font-weight: 500;
  }

  .m-agenda-loc {
    color: var(--color-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 140px;
  }

  .m-agenda-teacher {
    color: var(--color-text-tertiary);
  }

  .m-agenda-now-marker {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 2px 0 2px 52px;
    font-size: 11px;
    font-weight: 600;
    color: var(--color-primary);
  }

  .m-agenda-now-marker::before {
    content: '';
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
    animation: mPulse 2s infinite;
  }

  @keyframes mPulse {
    0%, 100% { box-shadow: 0 0 0 3px var(--color-primary-light); }
    50% { box-shadow: 0 0 0 6px rgba(37, 99, 235, 0.1); }
  }

  /* Desktop grid schedule hidden on mobile */
  .schedule-desktop-view {
    display: none;
  }

  .schedule-grid-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .schedule-grid {
    min-width: 640px;
  }

  /* ========== Analytics ========== */
  .analytics-grid {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-bottom: 12px;
  }

  .analytics-card {
    padding: 14px;
    border-radius: var(--radius-md);
    min-width: 0;
  }

  .analytics-card-title {
    font-size: 12px;
    margin-bottom: 10px;
  }

  .weekly-load {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .load-stat {
    padding: 10px 8px;
    border-radius: var(--radius);
  }

  .load-stat-value {
    font-size: 22px;
  }

  .load-stat-label {
    font-size: 11px;
  }

  .tab-bar {
    gap: 0;
    margin-bottom: 16px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
    margin-left: -14px;
    margin-right: -14px;
    padding-left: 14px;
    padding-right: 14px;
  }

  .tab-bar::-webkit-scrollbar { display: none; }

  .tab-bar-item {
    flex-shrink: 0;
    font-size: 13px;
    padding: 8px 14px;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  /* Tables in analytics */
  .stat-table th,
  .stat-table td {
    padding: 8px 10px;
    font-size: 12px;
  }

  .stat-table th {
    font-size: 11px;
    white-space: nowrap;
  }

  .stat-table {
    min-width: 560px;
  }

  .analytics-card .table-scroll {
    margin: 0 -14px;
    padding: 0 14px;
  }

  .locations-cell {
    max-width: none;
    white-space: nowrap;
  }

  /* ========== Compare ========== */
  .compare-selector-row {
    gap: 12px;
    flex-direction: column;
    margin-bottom: 16px;
    min-width: 0;
  }

  .compare-selector {
    width: 100%;
    min-width: 0;
  }

  .compare-selector select {
    width: 100%;
    min-width: 0;
    font-size: 14px;
    padding: 10px 12px;
    min-height: 44px;
  }

  .compare-row {
    grid-template-columns: 1fr;
  }

  /* ========== Data page ========== */
  .data-info-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0;
  }

  .data-info-item {
    padding: 8px 0;
  }

  .data-info-item:nth-child(odd) { padding-right: 8px; }
  .data-info-item:nth-child(even) { padding-left: 8px; }

  .data-info-label {
    font-size: var(--text-sm);
  }

  .data-info-value {
    font-size: var(--text-base);
  }

  /* ========== Settings ========== */
  .settings-row {
    padding: 14px 0;
    min-height: 56px;
  }

  .settings-label {
    font-size: 14px;
  }

  .toggle-switch {
    width: 44px;
    height: 24px;
  }

  .toggle-switch::after {
    width: 20px;
    height: 20px;
    top: 2px;
    left: 2px;
  }

  .toggle-switch.on::after {
    transform: translateX(20px);
  }

  .settings-select {
    padding: 8px 12px;
    font-size: 14px;
    min-height: 40px;
  }

  /* ========== Search results ========== */
  .search-results {
    gap: 6px;
    margin-top: 12px;
  }

  .search-result-item {
    padding: 12px 14px;
    border-radius: var(--radius);
    gap: 10px;
  }

  .search-result-name {
    font-size: 14px;
  }

  .search-result-meta {
    font-size: 12px;
    line-height: 1.4;
  }

  /* ========== Course cards grid ========== */
  .course-card-name {
    font-size: 12px;
    line-height: 1.3;
    white-space: normal;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .course-card-meta {
    font-size: 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* ========== Buttons ========== */
  .btn {
    font-size: 14px;
    padding: 10px 16px;
    min-height: 44px;
    min-width: 44px;
  }

  .btn-icon {
    width: 40px;
    height: 40px;
    min-height: 40px;
    min-width: 40px;
  }

  .week-nav-btn {
    width: 40px;
    height: 40px;
    min-height: 40px;
  }

  /* ========== Free time ========== */
  .free-time-slots {
    height: 28px;
  }

  .free-slot {
    font-size: 9px;
  }

  .free-time-chip {
    min-width: 0;
    padding: 8px 10px;
  }

  .free-time-chip-value {
    font-size: 16px;
  }

  /* ========== Badges ========== */
  .badge {
    font-size: 11px;
    padding: 3px 8px;
  }
}

/* ===== Tablet (769px — 1024px) ===== */
@media (min-width: 769px) and (max-width: 1024px) {
  .page-container {
    padding: 20px 16px;
    max-width: 100%;
  }

  .analytics-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .app-header-inner {
    padding: 0 16px;
  }

  .main-nav {
    gap: 0;
  }

  .nav-item {
    padding: 8px 12px;
    font-size: 12px;
  }

  .schedule-grid {
    grid-template-columns: 56px repeat(5, 1fr);
  }
}

/* ===== Desktop wide (1025px — 1439px) ===== */
@media (min-width: 1025px) and (max-width: 1439px) {
  .page-container {
    padding: 24px 20px;
  }
}

/* ===== Large desktop (≥1440px) ===== */
@media (min-width: 1440px) {
  :root {
    --max-width: 1280px;
  }

  .page-container {
    padding: 28px;
  }
}

/* ===== Touch device optimizations ===== */
@media (hover: none) and (pointer: coarse) {
  .course-card:hover {
    border-color: var(--color-border);
    box-shadow: none;
  }

  .nav-item:hover {
    background: transparent;
    color: inherit;
  }

  .nav-item.active:hover {
    color: var(--color-primary);
  }

  .btn:active {
    transform: scale(0.98);
  }

  .week-nav-btn:active {
    transform: scale(0.95);
  }

  .tab-bar-item:active {
    opacity: 0.6;
  }
}

/* ===== Landscape mobile ===== */
@media (max-width: 768px) and (orientation: landscape) {
  .bottom-nav {
    height: 48px;
  }

  :root {
    --bottom-nav-height: 48px;
  }

  .mobile-header {
    height: 38px;
  }

  :root {
    --mobile-header-height: 38px;
  }
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .page-view.active {
    animation: none;
  }

  .m-agenda-item {
    animation: none;
  }

  .m-search-bar {
    animation: none;
  }

  .bottom-nav-item.active::before {
    animation: none;
  }

  .timeline-now-dot {
    animation: none;
  }

  .m-agenda-now-marker::before {
    animation: none;
  }
}