/* ==========================================================================
    style.css  —  Base theme, layout shell, header, sidebar, nav, footer,
    buttons, alerts, dropdown, utilities & animations.
    Controller of Examinations ERP portal (H.K.R.H College)
    ========================================================================== */

/* ── Theme variables ─────────────────────────────────────────────────── */
:root {
    --primary:        #16a34a;
    --primary-dark:   #15803d;
    --primary-darker: #0b6b2d;
    --primary-light:  #dcfce7;
    --primary-tint:   #f0fdf4;

    --green:        #16a34a;
    --green-dark:   #0b6b2d;
    --green-darker: #15803d;
    --green-light:  #eefaf0;
    --green-lighter:#f8fdf9;
    --green-tint:   #f0fff4;
    --border-green: #cdebd5;

    --sidebar-bg:    #064e3b;
    --sidebar-text:  #cbd5e1;
    --sidebar-active:#16a34a;
    --sidebar-hover: rgba(255,255,255,0.06);

    --bg:           #f0fdf4;
    --card-bg:      #ffffff;

    --text:       #1e293b;
    --text-soft:  #1f2937;
    --text-muted: #64748b;
    --text-muterg:#6b7280;

    --danger:   #c10000;
    --danger-2: #dc2626;
    --danger-bg:#fff2f2;
    --success:  #0a9c39;
    --success-bg:#f0fff4;
    --amber:    #e67e22;
    --amber-bg: #fffbeb;
    --blue:     #2563eb;
    --blue-bg:  #eff6ff;
    --gray:     #6b7280;
    --gray-bg:  #f3f4f6;
    --purple:   #7c3aed;
    --ruby:     #9d1749;

    --radius:    16px;
    --radius-sm: 10px;
    --radius-lg: 20px;

    --shadow:    0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-sm: 0 4px 14px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.06);

    --border: #e2e8f0;

    --sidebar-w: 280px;
    --topbar-h:  68px;

    --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* ── Reset & base ────────────────────────────────────────────────────── */
* { margin: 0; padding: 0; box-sizing: border-box; }

html, body { height: 100%; }

body {
    font-family: var(--font);
    background: var(--bg);
    min-height: 100vh;
    color: var(--text);
    font-size: 15px;
    line-height: 1.5;
}

a { color: var(--green); text-decoration: none; }
a:hover { color: var(--green-darker); }

img { max-width: 100%; }

/* ── App layout shell ───────────────────────────────────────────────── */
.app {
    display: flex;
    min-height: 100vh;
}

/* Top bar (navbar / topbar) */
.topbar {
    position: fixed;
    top: 0;
    left: var(--sidebar-w);
    right: 0;
    z-index: 100;
    height: var(--topbar-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 0 28px;
    background: #fff;
    color: var(--text);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
}
.topbar .topbar-left { display: flex; align-items: center; gap: 14px; }
.topbar .topbar-left .page-title-nav { font-size: 18px; font-weight: 700; color: var(--text); line-height: 1.2; }
.topbar .topbar-left .breadcrumb { font-size: 12px; color: var(--text-muted); }

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text);
    font-size: 20px;
    cursor: pointer;
    padding: 6px;
    border-radius: 8px;
}
.mobile-toggle:hover { background: var(--primary-light); }

.topbar .topbar-right { display: flex; align-items: center; gap: 18px; }
.topbar .topbar-right .datetime { font-size: 13px; color: var(--text-muted); text-align: right; line-height: 1.4; }
.topbar .topbar-right .datetime .time { font-weight: 600; color: var(--text); }

.topbar .admin-info {
    display: flex;
    align-items: center;
    gap: 10px;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font);
    padding: 4px 6px;
    border-radius: 10px;
    transition: background .2s;
}
.topbar .admin-info:hover { background: var(--primary-light); }
.topbar .admin-avatar {
    width: 38px; height: 38px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 14px;
}
.topbar .admin-name { font-size: 13px; font-weight: 600; text-align: left; line-height: 1.2; }
.topbar .admin-role { font-size: 11px; color: var(--text-muted); text-align: left; }
.topbar .admin-chevron { font-size: 11px; color: var(--text-muted); margin-left: 2px; }

/* Sidebar (dark green theme) */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-w);
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    z-index: 1000;
    transition: transform .25s ease;
    display: flex;
    flex-direction: column;
    box-shadow: 4px 0 24px rgba(0,0,0,0.12);
}
.sidebar .sidebar-close {
    display: none;
    position: absolute;
    top: 16px; right: 16px;
    background: none; border: none;
    color: #fff; font-size: 24px; cursor: pointer;
}
.sidebar .sidebar-header {
    padding: 26px 20px 18px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.sidebar .sidebar-header .logo-img {
    width: 54px; height: 54px;
    object-fit: contain;
    margin-bottom: 10px;
    border-radius: 10px;
    background: #fff;
    padding: 5px;
}
.sidebar .sidebar-header .logo { font-size: 26px; font-weight: 800; color: #fff; letter-spacing: -0.5px; }
.sidebar .sidebar-header .logo span { color: #4ade80; }
.sidebar .sidebar-header .tagline { font-size: 11px; color: #fff; margin-top: 4px; letter-spacing: 0.5px; text-transform: uppercase; font-weight: 600; background: #16a34a; display: inline-block; padding: 5px 12px; border-radius: 12px; box-shadow: 0 2px 8px rgba(22,163,74,0.25); }

.sidebar .sidebar-nav { flex: 1; overflow-y: auto; padding: 14px 0; display: flex; flex-direction: column; gap: 2px; }
.sidebar .sidebar-nav a,
.sidebar .nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 13px 24px;
    margin: 2px 12px;
    border-radius: 10px;
    color: var(--sidebar-text);
    font-size: 14px;
    font-weight: 500;
    transition: background .2s, color .2s;
}
.sidebar .sidebar-nav a .ico,
.sidebar .nav-item i { width: 20px; text-align: center; font-size: 15px; }
.sidebar .sidebar-nav a:hover,
.sidebar .nav-item:hover { background: var(--sidebar-hover); color: #fff; }
.sidebar .sidebar-nav a.active,
.sidebar .nav-item--active {
    background: var(--sidebar-active);
    color: #fff;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(22,163,74,0.35);
}
.sidebar .nav-item--logout { margin-top: 12px; border-top: 1px solid rgba(255,255,255,0.08); padding-top: 18px; color: #fca5a5; }
.sidebar .nav-item--logout:hover { background: rgba(220,38,38,0.18); color: #fff; }
.sidebar .nav-item--danger { color: #fca5a5; }
.sidebar .nav-item--danger:hover { background: rgba(220,38,38,0.18); color: #fff; }
.sidebar .nav-item--danger.nav-item--active { background: var(--danger); color: #fff; box-shadow: 0 4px 12px rgba(220,38,38,0.35); }

.sidebar .sidebar-group { }
.sidebar .sidebar-group-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 13px 24px;
    margin: 2px 12px;
    border-radius: 10px;
    color: var(--sidebar-text);
    font-size: 14px;
    font-weight: 500;
    transition: background .2s, color .2s;
    cursor: pointer;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    font-family: var(--font);
}
.sidebar .sidebar-group-header:hover { background: var(--sidebar-hover); color: #fff; }
.sidebar .sidebar-group-header i:first-child { width: 20px; text-align: center; font-size: 15px; }
.sidebar .sidebar-group-chevron {
    margin-left: auto;
    font-size: 11px;
    color: var(--text-muted);
    transition: transform .25s ease;
}
.sidebar-group--open .sidebar-group-chevron { transform: rotate(180deg); }
.sidebar-group-items {
    display: none;
    flex-direction: column;
    gap: 0;
}
.sidebar-group--open .sidebar-group-items { display: flex; }
.sidebar .nav-item--child {
    padding-left: 56px;
    font-size: 13px;
    color: #94a3b8;
    border-left: 2px solid transparent;
    margin-left: 18px;
    padding-right: 12px;
}
.sidebar .nav-item--child i { font-size: 13px; width: 16px; text-align: center; color: #64748b; }
.sidebar .nav-item--child:hover {
    color: #e2e8f0;
    background: var(--sidebar-hover);
    border-left-color: #4ade80;
}
.sidebar .nav-item--child.nav-item--active {
    color: #fff;
    background: rgba(22,163,74,0.18);
    border-left-color: #4ade80;
    box-shadow: none;
    font-weight: 600;
}

.sidebar .sidebar-footer { padding: 16px 20px; border-top: 1px solid rgba(255,255,255,0.08); font-size: 12px; color: #64748b; text-align: center; }

.sidebar .side-brand { display: none; }
.sidebar .side-section { display: none; }

 /* Generic centred container (auth / public / standalone pages) */
 .container { max-width: 1100px; width: 100%; margin: 0 auto; }

 /* Wider containers for reports / result pages (do NOT touch .container) */
 .container-lg { max-width: 1280px; width: 100%; margin: 0 auto; }
 .container-xl { max-width: 1800px; width: 100%; margin: 0 auto; }

  /* Fallback wide container used when a page is not inside .content */
 .container-wide{
     width:98%;
     max-width:1800px;
     margin:0 auto;
 }
  /* Content area */
  .content {
     margin-left: var(--sidebar-w);
     margin-top: var(--topbar-h);
     padding: 28px 32px;
     flex: 1;
     min-height: calc(100vh - var(--topbar-h));
  }

/* Page header + title (rendered by page_header.php) */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}
.page-header h1 { font-size: 22px; font-weight: 700; color: var(--text); }
.page-header .breadcrumb { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

.content-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    overflow: hidden;
}
.content-card.narrow  { max-width: 700px; }
.content-card.medium  { max-width: 1000px; }
.content-card.wide    { max-width: 1280px; }
.content-card.large   { max-width: 1600px; }
/* Full-bleed admin table card: span the whole content area, never squeeze tables */
.content-card.full    {
    max-width: 100%;
    width: 100%;
    padding-left: 18px;
    padding-right: 18px;
}

.page-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; align-items: center; }

/* ── Footer ─────────────────────────────────────────────────────────── */
.app-footer {
    margin-top: auto;
    padding: 18px 32px;
    text-align: center;
    color: var(--text-muterg);
    font-size: 12px;
    border-top: 1px solid var(--border);
    background: transparent;
}
.app-footer .footer-strong { color: var(--green-dark); font-weight: 600; }

/* ── Public page footer (centred standalone pages) ─────────────────── */
.footer {
    text-align: center;
    padding: 20px;
    color: var(--text-muterg);
    font-size: 12px;
    border-top: 1px solid var(--border);
    margin-top: 30px;
}

/* ── Buttons (shared) ───────────────────────────────────────────────── */
.btn,
.link-btn,
.back-btn,
.upload-btn,
.login-btn {
    display: inline-block;
    padding: 11px 22px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--green);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: background .25s, transform .15s;
}
.btn:hover,
.link-btn:hover,
.back-btn:hover,
.upload-btn:hover,
.login-btn:hover { background: var(--green-darker); color: #fff; transform: translateY(-1px); }

.btn-danger,
.danger { background: var(--danger); }
.btn-danger:hover,
.danger:hover { background: #a00000; }

.btn-warning { background: var(--amber); }
.btn-warning:hover { background: #c2691b; }

.btn-info { background: var(--blue); }
.btn-info:hover { background: #1d4ed8; }

.btn-success { background: var(--success); }
.btn-success:hover { background: #088a32; }

.btn-ghost {
    background: #fff;
    color: var(--green);
    border: 2px solid var(--green);
}
.btn-ghost:hover { background: var(--green-light); }

.btn[disabled], .btn:disabled { background: #9ca3af; cursor: not-allowed; transform: none; }

/* ── Alerts / boxes ─────────────────────────────────────────────────── */
.success-box,
.error-box,
.info-box {
    padding: 18px;
    border-radius: 12px;
    margin-top: 20px;
    text-align: center;
    font-weight: 600;
}
.success-box { background: var(--success-bg); color: var(--green-dark); border-left: 5px solid var(--green); }
.error-box   { background: var(--danger-bg);  color: var(--danger);     border-left: 5px solid #ff0000; }
.info-box    { background: var(--amber-bg);   color: #78350f;           border-left: 5px solid var(--amber); }
.info-box strong { color: var(--green-dark); }

/* ── Dropdown (account menu) ────────────────────────────────────────── */
.dropdown { position: relative; display: inline-block; }
.dropdown-menu {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    min-width: 220px;
    overflow: hidden;
    z-index: 200;
    padding: 6px;
    flex-direction: column;
}
.dropdown-menu.show { display: flex; }
.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #fff;
    color: var(--text);
    padding: 11px 14px;
    font-size: 14px;
    font-weight: 500;
    text-align: left;
    border-radius: 8px;
}
.dropdown-menu a i { color: var(--primary); width: 18px; text-align: center; }
.dropdown-menu a:hover { background: var(--primary-light); color: var(--primary-dark); }
.dropdown-menu a.danger { color: var(--danger); }
.dropdown-menu a.danger i { color: var(--danger); }
.dropdown-menu a.danger:hover { background: #fff5f5; }
.dropdown-menu .divider { border: none; border-top: 1px solid var(--border); margin: 4px 0; }

/* ── Utilities ──────────────────────────────────────────────────────── */
.spacer { height: 24px; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.mt-10 { margin-top: 10px; } .mt-15 { margin-top: 15px; } .mt-20 { margin-top: 20px; } .mt-25 { margin-top: 25px; }
.mb-10 { margin-bottom: 10px; } .mb-15 { margin-bottom: 15px; } .mb-20 { margin-bottom: 20px; }
.d-flex { display: flex; } .gap-10 { gap: 10px; } .gap-15 { gap: 15px; }
.flex-wrap { flex-wrap: wrap; }
.flex-center { justify-content: center; align-items: center; }
.hidden { display: none !important; }

/* ── Animations ─────────────────────────────────────────────────────── */
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.fade-in { animation: fadeIn .35s ease both; }

/* ── Loading spinner ────────────────────────────────────────────────── */
.loading-overlay {
    position: fixed; inset: 0;
    background: rgba(255,255,255,.6);
    display: none; align-items: center; justify-content: center;
    z-index: 9998;
}
.loading-overlay.show { display: flex; }
.spinner {
    width: 44px; height: 44px;
    border: 5px solid var(--green-light);
    border-top-color: var(--green);
    border-radius: 50%;
    animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Back to top ────────────────────────────────────────────────────── */
.back-to-top {
    position: fixed; right: 20px; bottom: 20px;
    width: 44px; height: 44px;
    border-radius: 50%;
    background: var(--green);
    color: #fff; border: none;
    font-size: 20px; cursor: pointer;
    box-shadow: var(--shadow);
    display: none; align-items: center; justify-content: center;
    z-index: 150;
}
.back-to-top.show { display: flex; }
.back-to-top:hover { background: var(--green-darker); }

/* ── Sidebar overlay (mobile) ───────────────────────────────────────── */
.sidebar-overlay {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0,0,0,.4);
    z-index: 1050;
}
.sidebar-overlay.show { display: block; }
.sidebar-overlay.show { display: block; }