/* Western Province Paper Sharing System - Custom CSS
   Theme: matched to the main wpedu.lk site — gold as the primary accent,
   emerald/violet/sky as secondary accents. Supports both dark (default)
   and light mode via [data-bs-theme], toggled by js/theme-toggle.js. */

/* ============ Theme Tokens — Dark (default) ============ */
:root {
  color-scheme: dark;

  --primary-color: #0f172a;     /* surfaces (navbar, hero, card headers) */
  --primary-dark: #05070f;      /* deepest ground */
  --secondary-color: #94a3b8;
  --success-color: #34d399;     /* emerald */
  --info-color: #60a5fa;        /* sky */
  --warning-color: #fbbf24;     /* gold — primary accent (same in both themes) */
  --danger-color: #f87171;
  --accent-color: #a78bfa;      /* violet */
  --light-color: #1e293b;
  --dark-color: #f1f5f9;
  --gold-bright: #fbbf24;
  --gold: #f59e0b;
  --font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  /* Semantic surface/text/border tokens — every component rule below reads
     from these, so a theme switch only has to redefine this block. */
  --text-heading: #f8fafc;
  --text-body: #e2e8f0;
  --text-muted: #94a3b8;
  --surface-solid: #0f172a;       /* opaque panel (navbar, dropdowns, modals) */
  --surface-1: rgba(15, 23, 42, 0.6);   /* translucent card/panel */
  --surface-2: rgba(15, 23, 42, 0.85);  /* translucent header bar within a card */
  --overlay-02: rgba(255, 255, 255, 0.02);
  --overlay-04: rgba(255, 255, 255, 0.04);
  --overlay-05: rgba(255, 255, 255, 0.05);
  --overlay-06: rgba(255, 255, 255, 0.06);
  --overlay-08: rgba(255, 255, 255, 0.08);
  --overlay-10: rgba(255, 255, 255, 0.1);
  --overlay-14: rgba(255, 255, 255, 0.14);
  --border-soft: rgba(255, 255, 255, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.4);
  --btn-on-accent: #0f172a;       /* text color used on gold/emerald/sky buttons */
  --page-bg:
    radial-gradient(circle at 15% 20%, rgba(52, 211, 153, 0.09), transparent 40%),
    radial-gradient(circle at 85% 15%, rgba(251, 191, 36, 0.07), transparent 38%),
    radial-gradient(circle at 45% 90%, rgba(167, 139, 250, 0.06), transparent 44%),
    linear-gradient(180deg, #05070f 0%, #0a0f1e 55%, #070b18 100%);

  /* Re-point Bootstrap's own theme colors so every bg-*/text-*/border-*
     utility (used throughout the markup) follows the same palette. */
  --bs-primary: #0f172a;
  --bs-primary-rgb: 15, 23, 42;
  --bs-secondary: #94a3b8;
  --bs-secondary-rgb: 148, 163, 184;
  --bs-success: #34d399;
  --bs-success-rgb: 52, 211, 153;
  --bs-info: #60a5fa;
  --bs-info-rgb: 96, 165, 250;
  --bs-warning: #fbbf24;
  --bs-warning-rgb: 251, 191, 36;
  --bs-danger: #f87171;
  --bs-danger-rgb: 248, 113, 113;
  --bs-light: #1e293b;
  --bs-light-rgb: 30, 41, 59;
  --bs-dark: #f1f5f9;
  --bs-dark-rgb: 241, 245, 249;
  --bs-body-bg: #05070f;
  --bs-body-color: #e2e8f0;
  --bs-link-color: #fbbf24;
  --bs-link-color-rgb: 251, 191, 36;
  --bs-link-hover-color: #fde68a;
  --bs-border-color: rgba(255, 255, 255, 0.1);
}

/* ============ Theme Tokens — Light ============ */
:root[data-bs-theme="light"] {
  color-scheme: light;

  --primary-color: #1c3d5a;
  --primary-dark: #142c40;
  --secondary-color: #55606b;
  --success-color: #1e7145;
  --info-color: #2f6690;
  --warning-color: #b8860b;
  --danger-color: #a4243b;
  --accent-color: #6d4fc4;
  --light-color: #f5f6f8;
  --dark-color: #1c232c;
  --gold-bright: #f59e0b;
  --gold: #b8860b;

  --text-heading: #182230;
  --text-body: #2b333b;
  --text-muted: #5b6675;
  --surface-solid: #1c3d5a;
  --surface-1: #ffffff;
  --surface-2: #eef1f5;
  --overlay-02: rgba(15, 23, 42, 0.02);
  --overlay-04: rgba(15, 23, 42, 0.04);
  --overlay-05: rgba(15, 23, 42, 0.05);
  --overlay-06: rgba(15, 23, 42, 0.05);
  --overlay-08: rgba(15, 23, 42, 0.06);
  --overlay-10: rgba(15, 23, 42, 0.08);
  --overlay-14: rgba(15, 23, 42, 0.1);
  --border-soft: rgba(15, 23, 42, 0.1);
  --shadow-color: rgba(28, 61, 90, 0.12);
  --btn-on-accent: #ffffff;
  --page-bg:
    radial-gradient(circle at 15% 20%, rgba(30, 113, 69, 0.05), transparent 40%),
    radial-gradient(circle at 85% 15%, rgba(184, 134, 11, 0.05), transparent 38%),
    linear-gradient(180deg, #f7f8fa 0%, #eef1f5 100%);

  --bs-primary: #1c3d5a;
  --bs-primary-rgb: 28, 61, 90;
  --bs-secondary: #55606b;
  --bs-secondary-rgb: 85, 96, 107;
  --bs-success: #1e7145;
  --bs-success-rgb: 30, 113, 69;
  --bs-info: #2f6690;
  --bs-info-rgb: 47, 102, 144;
  --bs-warning: #b8860b;
  --bs-warning-rgb: 184, 134, 11;
  --bs-danger: #a4243b;
  --bs-danger-rgb: 164, 36, 59;
  --bs-light: #f5f6f8;
  --bs-light-rgb: 245, 246, 248;
  --bs-dark: #1c232c;
  --bs-dark-rgb: 28, 35, 44;
  --bs-body-bg: #f4f6f9;
  --bs-body-color: #2b333b;
  --bs-link-color: #b8860b;
  --bs-link-color-rgb: 184, 134, 11;
  --bs-link-hover-color: #966c09;
  --bs-border-color: rgba(15, 23, 42, 0.1);
}

/* ============ Body & General ============ */
body {
  font-family: var(--font-family);
  background: var(--page-bg);
  background-attachment: fixed;
  line-height: 1.6;
  color: var(--text-body);
}

a {
  color: var(--warning-color);
}

a:hover {
  filter: brightness(1.15);
}

/* ============ Theme toggle button ============ */
.pus-theme-toggle {
  appearance: none; border: 1px solid var(--overlay-14); background: var(--overlay-06);
  color: var(--text-body); width: 38px; height: 38px; border-radius: 999px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer; transition: background-color .2s ease, border-color .2s ease, transform .2s ease;
}
.pus-theme-toggle:hover { background: var(--overlay-10); transform: translateY(-1px); }
.pus-theme-toggle i { color: var(--warning-color); font-size: .95rem; }

/* ============ Navigation ============ */
.navbar.bg-primary,
.navbar.bg-danger {
  background: var(--surface-2) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-soft);
  box-shadow: 0 1px 0 rgba(251, 191, 36, 0.15);
}

.navbar-brand {
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: 0.2px;
  color: var(--text-heading) !important;
}

.navbar-brand i {
  margin-right: 8px;
  color: var(--warning-color);
}

.navbar-brand img,
.brand-logo {
  height: 36px;
  width: auto;
  margin-right: 8px;
  vertical-align: middle;
}

.auth-card-logo {
  height: 52px;
  width: auto;
  margin-bottom: 8px;
}

.hero-logo {
  height: 60px;
  width: auto;
  margin-right: 12px;
  vertical-align: middle;
}

.navbar-nav .nav-link {
  font-weight: 500;
  color: var(--text-body) !important;
  opacity: .85;
}

.navbar-nav .nav-link:hover {
  color: var(--warning-color) !important;
  opacity: 1;
}

.navbar-nav .nav-link.active {
  background-color: rgba(251, 191, 36, 0.12);
  color: var(--warning-color) !important;
  opacity: 1;
  border-radius: 4px;
}

/* ============ Cards ============ */
.card {
  background: var(--surface-1);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: var(--text-body);
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  box-shadow: 0 1px 3px var(--shadow-color);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  margin-bottom: 1.5rem;
}

.card:hover {
  box-shadow: 0 4px 16px var(--shadow-color);
  border-color: rgba(251, 191, 36, 0.25);
}

.card-header {
  background: var(--surface-2) !important;
  border-bottom: 1px solid var(--border-soft);
  border-radius: 8px 8px 0 0 !important;
  font-weight: 600;
  padding: 1rem 1.25rem;
  color: var(--text-heading);
}

.card-header h4,
.card-header h5 {
  margin: 0;
}

.card-header i {
  margin-right: 8px;
  color: var(--warning-color);
}

.card-body {
  color: var(--text-body);
}

.text-muted {
  color: var(--text-muted) !important;
}

/* ============ Buttons ============ */
.btn {
  border-radius: 6px;
  font-weight: 500;
  padding: 0.5rem 1rem;
  transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease, filter 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn i {
  margin-right: 5px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gold), var(--gold-bright));
  border-color: var(--gold-bright);
  color: #0f172a;
  font-weight: 700;
}

.btn-primary:hover,
.btn-primary:focus {
  filter: brightness(1.08);
  border-color: var(--gold-bright);
  color: #0f172a;
}

.btn-success {
  background-color: var(--success-color);
  border-color: var(--success-color);
  color: var(--btn-on-accent);
}

.btn-success:hover {
  filter: brightness(1.12);
  color: var(--btn-on-accent);
}

.btn-warning {
  background-color: var(--warning-color);
  border-color: var(--warning-color);
  color: var(--btn-on-accent);
}

.btn-warning:hover {
  filter: brightness(1.12);
  color: var(--btn-on-accent);
}

.btn-danger {
  background-color: var(--danger-color);
  border-color: var(--danger-color);
  color: var(--btn-on-accent);
}

.btn-danger:hover {
  filter: brightness(1.12);
  color: var(--btn-on-accent);
}

.btn-info {
  background-color: var(--info-color);
  border-color: var(--info-color);
  color: var(--btn-on-accent);
}

.btn-info:hover {
  filter: brightness(1.12);
  color: var(--btn-on-accent);
}

.btn-secondary {
  background-color: var(--overlay-14);
  border-color: var(--overlay-14);
  color: var(--text-body);
}

.btn-secondary:hover {
  background-color: var(--overlay-14);
  filter: brightness(1.2);
  color: var(--text-heading);
}

.btn-light {
  background-color: var(--overlay-08);
  border-color: var(--border-soft);
  color: var(--text-body);
}

.btn-light:hover {
  background-color: var(--overlay-14);
  color: var(--text-heading);
}

.btn-outline-primary {
  color: var(--warning-color);
  border-color: var(--warning-color);
}

.btn-outline-primary:hover {
  background-color: var(--warning-color);
  color: var(--btn-on-accent);
}

.btn-outline-secondary {
  color: var(--text-body);
  border-color: var(--overlay-14);
}

.btn-outline-secondary:hover {
  background-color: var(--overlay-10);
  color: var(--text-heading);
}

/* ============ Forms ============ */
.form-control,
.form-select {
  background-color: var(--overlay-05);
  border-radius: 6px;
  border: 1px solid var(--border-soft);
  color: var(--text-body);
  padding: 0.625rem 0.75rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.form-control::placeholder {
  color: var(--text-muted);
  opacity: .7;
}

.form-control:focus,
.form-select:focus {
  background-color: var(--overlay-08);
  border-color: var(--gold-bright);
  color: var(--text-heading);
  box-shadow: 0 0 0 0.2rem rgba(251, 191, 36, 0.15);
}

.form-select option {
  background-color: var(--surface-solid);
  color: var(--text-body);
}

:root[data-bs-theme="light"] .form-select option {
  background-color: #ffffff;
  color: var(--text-body);
}

.form-label {
  font-weight: 600;
  color: var(--text-heading);
  margin-bottom: 0.5rem;
}

.input-group-text {
  background-color: var(--overlay-06);
  border: 1px solid var(--border-soft);
  color: var(--text-body);
}

/* ============ Tables ============ */
.table {
  border-radius: 6px;
  overflow: hidden;
  color: var(--text-body);
}

.table th {
  background-color: var(--overlay-04);
  font-weight: 600;
  border: none;
  padding: 1rem 0.75rem;
  color: var(--text-heading);
}

.table td {
  padding: 1rem 0.75rem;
  border-color: var(--border-soft);
  vertical-align: middle;
  color: var(--text-body);
}

.table-striped > tbody > tr:nth-of-type(odd) > * {
  background-color: var(--overlay-02);
  color: var(--text-body);
}

.table-hover > tbody > tr:hover > * {
  background-color: rgba(251, 191, 36, 0.06);
  color: var(--text-heading);
}

/* ============ Badges ============ */
.badge {
  padding: 0.5em 0.75em;
  border-radius: 4px;
  font-weight: 500;
}

.badge.bg-light,
.badge.bg-light.text-dark {
  background-color: var(--overlay-08) !important;
  color: var(--text-body) !important;
  border: 1px solid var(--border-soft);
}

/* ============ Alerts ============ */
.alert {
  border: none;
  border-left: 4px solid transparent;
  border-radius: 6px;
  font-weight: 500;
  margin-bottom: 1.5rem;
}

.alert-success {
  background-color: rgba(52, 211, 153, 0.12);
  border-left-color: var(--success-color);
  color: var(--success-color);
}

.alert-danger {
  background-color: rgba(248, 113, 113, 0.12);
  border-left-color: var(--danger-color);
  color: var(--danger-color);
}

.alert-warning {
  background-color: rgba(251, 191, 36, 0.12);
  border-left-color: var(--warning-color);
  color: var(--gold);
}

.alert-info {
  background-color: rgba(96, 165, 250, 0.12);
  border-left-color: var(--info-color);
  color: var(--info-color);
}

.alert .btn-close {
  filter: none;
}

:root:not([data-bs-theme="light"]) .alert .btn-close {
  filter: invert(1) grayscale(100%) brightness(1.8);
}

/* ============ File Upload / Dynamic Fields ============ */
#new_grade_fields,
#new_subject_fields {
  background: rgba(251, 191, 36, 0.05);
  border: 1px dashed var(--warning-color);
  border-radius: 6px;
  padding: 15px;
}

option[value="0"] {
  background-color: var(--surface-solid);
  color: var(--warning-color);
  font-weight: 600;
}

:root[data-bs-theme="light"] option[value="0"] {
  background-color: #eaf0f5;
}

#new_grade_fields .form-label,
#new_subject_fields .form-label {
  color: var(--warning-color);
  font-weight: 600;
  margin-bottom: 5px;
}

#new_grade_fields .form-control,
#new_subject_fields .form-control {
  border: 1px solid var(--warning-color);
  background-color: var(--overlay-05);
}

#new_grade_fields .form-control:focus,
#new_subject_fields .form-control:focus {
  border-color: var(--gold-bright);
  box-shadow: 0 0 0 0.2rem rgba(251, 191, 36, 0.15);
}

/* ============ Paper Cards ============ */
.paper-card {
  background: var(--surface-1);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-soft);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1rem;
  box-shadow: 0 1px 3px var(--shadow-color);
}

.paper-title {
  font-weight: 600;
  color: var(--warning-color);
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.paper-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.paper-description {
  color: var(--text-body);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.paper-card-actions .btn {
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  font-weight: 500;
  min-width: 70px;
}

/* ============ Public Paper Browse (Homepage) ============ */
#papers-results.papers-loading {
  opacity: 0.5;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

.hover-shadow {
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
  border: 1px solid transparent;
}

.hover-shadow:hover {
  border-color: var(--warning-color);
  box-shadow: 0 4px 14px rgba(251, 191, 36, 0.15) !important;
}

.card-title.text-primary,
.text-primary {
  color: var(--warning-color) !important;
  transition: color 0.2s ease;
}

/* ============ Action Buttons (Tables / Admin) ============ */
.btn-group .btn {
  white-space: nowrap;
  min-width: auto;
}

.btn-group .btn:not(:last-child) {
  margin-right: 6px;
}

.btn-group .btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 500;
}

.btn-group .btn i {
  margin-right: 4px;
}

.table td:last-child {
  min-width: 180px;
  white-space: nowrap;
}

.table .btn-group {
  display: flex;
  gap: 4px;
}

.btn i + span {
  margin-left: 4px;
}

.btn-group .btn:focus {
  outline: 2px solid rgba(251, 191, 36, 0.5);
  outline-offset: 2px;
}

.btn-sm {
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ============ Hero / Call-to-action Buttons ============ */
.hero-buttons .btn {
  padding: 0.65rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 6px;
  min-width: 150px;
}

.hero-buttons .btn-light {
  background-color: var(--gold-bright);
  border: 1px solid var(--gold-bright);
  color: var(--btn-on-accent);
}

.hero-buttons .btn-light:hover {
  filter: brightness(1.1);
  color: var(--btn-on-accent);
}

.hero-buttons .btn-outline-light {
  border: 1px solid var(--overlay-14);
  background: transparent;
  color: var(--text-heading);
}

.hero-buttons .btn-outline-light:hover {
  background: var(--overlay-10);
  border-color: var(--text-heading);
}

.search-form-buttons .btn {
  padding: 0.55rem 1.2rem;
  font-weight: 500;
  border-radius: 6px;
  min-width: 120px;
}

.cta-section .btn {
  padding: 0.65rem 1.75rem;
  font-weight: 600;
  border-radius: 6px;
  min-width: 140px;
}

.cta-section {
  background: var(--surface-1) !important;
  border: 1px solid var(--border-soft);
}

footer .text-white {
  transition: color 0.2s ease;
}

footer .text-white:hover {
  color: var(--warning-color) !important;
}

/* ============ Section Styling (Homepage) ============ */
.browse-papers-section {
  background: var(--overlay-02);
  border-bottom: 1px solid var(--border-soft);
}

.features-section {
  background: var(--overlay-04);
}

.section-header {
  position: relative;
  padding-bottom: 1rem;
}

.section-header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--success-color), var(--warning-color), var(--accent-color));
  border-radius: 2px;
}

/* ============ Utility ============ */
.shadow-soft {
  box-shadow: 0 1px 3px var(--shadow-color) !important;
}

.shadow-medium {
  box-shadow: 0 4px 10px var(--shadow-color) !important;
}

.rounded-lg {
  border-radius: 8px !important;
}

.border-soft {
  border: 1px solid var(--border-soft) !important;
}

html {
  scroll-behavior: smooth;
}

/* ============ Dropdowns / Modals (Bootstrap components used site-wide) ============ */
.dropdown-menu {
  background-color: var(--surface-solid);
  border: 1px solid var(--border-soft);
}

.dropdown-item {
  color: var(--text-body);
}

.dropdown-item:hover,
.dropdown-item:focus {
  background-color: rgba(251, 191, 36, 0.1);
  color: var(--warning-color);
}

.dropdown-divider {
  border-color: var(--border-soft);
}

.modal-content {
  background-color: var(--surface-solid);
  color: var(--text-body);
  border: 1px solid var(--border-soft);
}

.pagination .page-link {
  background-color: var(--overlay-04);
  border-color: var(--border-soft);
  color: var(--text-body);
}

.pagination .page-link:hover {
  background-color: rgba(251, 191, 36, 0.12);
  color: var(--warning-color);
}

.pagination .page-item.active .page-link {
  background-color: var(--warning-color);
  border-color: var(--warning-color);
  color: var(--btn-on-accent);
}

.pagination .page-item.disabled .page-link {
  background-color: transparent;
  color: var(--text-muted);
  opacity: .5;
}

/* ============ Responsive ============ */
/* Systemic fix: many .row columns in this app only carry col-md-*/col-lg-*/col-xl-*
   classes with no base col-12. Bootstrap 5's .row is display:flex, and those
   breakpoint-only classes apply NO width below their breakpoint — so instead of
   stacking on phones, the columns shrink-wrap and sit cramped side-by-side. This
   forces any such column to full width below md, without needing to touch every
   occurrence individually. Columns that already carry a base col-6/col-4/etc (meant
   to stay multi-up even on phones) are untouched since this only matches the
   col-md-/col-lg-/col-xl- prefixes. */
@media (max-width: 767.98px) {
  .row > [class^="col-md-"],
  .row > [class*=" col-md-"],
  .row > [class^="col-lg-"],
  .row > [class*=" col-lg-"],
  .row > [class^="col-xl-"],
  .row > [class*=" col-xl-"] {
    flex: 0 0 100%;
    max-width: 100%;
    width: 100%;
  }

  .table td a.btn,
  .table td button.btn {
    margin: 2px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 15px;
  }

  .card-body {
    padding: 1rem;
  }

  .btn {
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
  }

  .table-responsive {
    font-size: 0.875rem;
  }

  .navbar-brand {
    font-size: 1.15rem;
  }

  .hero-buttons .btn {
    font-size: 0.95rem;
    padding: 0.55rem 1.4rem;
    min-width: 130px;
    margin-bottom: 0.5rem;
  }

  .paper-card-actions {
    gap: 5px;
  }

  .paper-card-actions .btn {
    padding: 0.35rem 0.6rem;
    font-size: 0.85rem;
    min-width: 60px;
  }

  .search-form-buttons .btn {
    font-size: 0.9rem;
    padding: 0.5rem 1rem;
    min-width: 100px;
    margin-bottom: 0.5rem;
  }

  .table .btn-group {
    flex-direction: column;
    align-items: stretch;
    gap: 3px;
  }

  .table .btn-group .btn {
    width: 100%;
    text-align: center;
    margin-right: 0 !important;
    font-size: 0.8rem;
    padding: 0.35rem 0.5rem;
  }

  .table td:last-child {
    min-width: 110px;
    padding: 0.75rem 0.5rem;
  }
}

@media (max-width: 576px) {
  .card-header h4 {
    font-size: 1.2rem;
  }
}