:root {
  /* Motyw Obsidian */
  --obsidian-darkest: #090a0f;
  --obsidian-bg: #111319;
  --obsidian-panel: #161822;
  --obsidian-card: #1c1f2c;
  --obsidian-border: #282c3f;
  --obsidian-border-hover: #3b415c;
  
  --text-main: #f1f3f7;
  --text-muted: #8a91a8;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-success: #10b981;
  --accent-success-glow: rgba(16, 185, 129, 0.45);
  --accent-danger: #f43f5e;

  --slot-height: 18px; /* 15 min = 18px */
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  user-select: none;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", sans-serif;
  background-color: var(--obsidian-bg);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
}

/* Widok logowania */
.login-screen {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at center, #1b1e2a 0%, var(--obsidian-darkest) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.login-card {
  width: 100%;
  max-width: 360px;
  background: var(--obsidian-panel);
  border: 1px solid var(--obsidian-border);
  border-radius: 12px;
  padding: 32px 28px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.login-card .logo-img {
  width: 300px;
  max-height: 60px;
  object-fit: contain;
  margin-bottom: 48px;
}

.login-card form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.login-error {
  color: var(--accent-danger);
  font-size: 0.8rem;
  text-align: center;
  min-height: 16px;
}

/* Główny kontener aplikacji */
#appContainer {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
}

/* Lewy pasek boczny */
aside {
  width: 340px;
  background: var(--obsidian-panel);
  border-right: 1px solid var(--obsidian-border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: 10;
}

.sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--obsidian-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.sidebar-logo {
  max-width: 300px;
  max-height: 55px;
  object-fit: contain;
}

.user-info-row {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.role-badge {
  padding: 2px 7px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
}
.role-badge.admin {
  background: rgba(99, 102, 241, 0.2);
  color: #818cf8;
  border: 1px solid rgba(99, 102, 241, 0.4);
}
.role-badge.viewer {
  background: rgba(138, 145, 168, 0.15);
  color: var(--text-muted);
  border: 1px solid var(--obsidian-border);
}

.sidebar-content {
  padding: 16px;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card {
  background: var(--obsidian-card);
  border: 1px solid var(--obsidian-border);
  border-radius: 8px;
  padding: 14px;
}

.card h2 {
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #cbd5e1;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group {
  margin-bottom: 10px;
}

.form-group label {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 4px;
}

input, select, textarea {
  width: 100%;
  padding: 8px 10px;
  background: var(--obsidian-darkest);
  border: 1px solid var(--obsidian-border);
  border-radius: 6px;
  color: #fff;
  font-size: 0.82rem;
  outline: none;
  font-family: inherit;
  transition: border-color 0.2s;
  user-select: auto;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--accent-primary);
}

.btn {
  padding: 8px 12px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
  border: 1px solid var(--obsidian-border);
  background: var(--obsidian-card);
  color: var(--text-main);
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn:hover {
  background: #25293a;
  border-color: var(--obsidian-border-hover);
}

.btn-primary {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-primary-hover);
}

/* Wysuwany prawy panel dla bazy uczniów */
.drawer-toggle-btn {
  position: fixed;
  top: 14px;
  right: 20px;
  z-index: 50;
  background: var(--obsidian-panel);
  box-shadow: 0 4px 14px rgba(0,0,0,0.5);
}

.drawer-panel {
  position: fixed;
  top: 0;
  right: -420px;
  width: 400px;
  height: 100vh;
  background: var(--obsidian-panel);
  border-left: 1px solid var(--obsidian-border);
  box-shadow: -12px 0 30px rgba(0, 0, 0, 0.6);
  transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 60;
  display: flex;
  flex-direction: column;
}

.drawer-panel.open {
  right: 0;
}

.drawer-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--obsidian-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.drawer-content {
  padding: 16px;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.student-edit-card {
  background: var(--obsidian-card);
  border: 1px solid var(--obsidian-border);
  border-radius: 8px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.student-edit-card .header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Główny kontener siatki */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  background: var(--obsidian-darkest);
}

.schedule-header {
  display: grid;
  grid-template-columns: 60px repeat(6, 1fr);
  background: var(--obsidian-panel);
  border-bottom: 1px solid var(--obsidian-border);
  padding-right: 8px;
}

.day-header-cell {
  padding: 12px;
  text-align: center;
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--text-main);
  border-left: 1px solid var(--obsidian-border);
}

.schedule-viewport {
  flex: 1;
  overflow-y: scroll;
  position: relative;
}

.schedule-grid {
  display: grid;
  grid-template-columns: 60px repeat(6, 1fr);
  position: relative;
  height: calc(12 * 4 * var(--slot-height));
}

.time-labels {
  display: flex;
  flex-direction: column;
  background: var(--obsidian-panel);
  border-right: 1px solid var(--obsidian-border);
}

.time-slot-label {
  height: calc(4 * var(--slot-height));
  text-align: center;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 1px solid var(--obsidian-border);
  padding-top: 2px;
}

.day-column {
  position: relative;
  border-left: 1px solid var(--obsidian-border);
  background-image: 
    linear-gradient(to bottom, var(--obsidian-border) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(40, 44, 63, 0.4) 1px, transparent 1px);
  background-size: 100% calc(4 * var(--slot-height)), 100% var(--slot-height);
}

/* Bloki lekcji */
.lesson-block {
  position: absolute;
  left: 3px;
  right: 3px;
  background: #232738;
  border: 1px solid #3d4460;
  border-radius: 6px;
  padding: 5px 7px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  z-index: 2;
}

.lesson-block.can-drag {
  cursor: grab;
}
.lesson-block.can-drag:active {
  cursor: grabbing;
}

.lesson-block.confirmed {
  background: #0d2f24;
  border-color: var(--accent-success);
  box-shadow: 0 0 14px var(--accent-success-glow), inset 0 0 6px rgba(16, 185, 129, 0.2);
}

.lesson-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  margin-bottom: 2px;
  gap: 4px;
}

.lesson-title {
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: #fff;
  flex: 1;
}

.lesson-controls {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
}

.confirm-checkbox {
  cursor: pointer;
  accent-color: var(--accent-success);
  width: 13px;
  height: 13px;
}

.btn-delete-lesson {
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.4);
  font-size: 14px;
  cursor: pointer;
  line-height: 1;
  padding: 0 2px;
}
.btn-delete-lesson:hover {
  color: var(--accent-danger);
}

.lesson-details {
  font-size: 0.67rem;
  color: #94a3b8;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  pointer-events: none;
}

.lesson-block.confirmed .lesson-details {
  color: #a7f3d0;
}

.resize-handle {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 5px;
  cursor: ns-resize;
  background: transparent;
}
.resize-handle:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--obsidian-darkest);
}
::-webkit-scrollbar-thumb {
  background: var(--obsidian-border);
  border-radius: 3px;
}