:root {
  /* Light Theme (default) */
  --bg-main: #f1f5f9;
  --glass: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.1);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent: #2563eb;
  --input-bg: rgba(0, 0, 0, 0.04);
  --input-border: rgba(0, 0, 0, 0.12);
  --input-hover-bg: rgba(0, 0, 0, 0.08);
  --input-hover-border: rgba(0, 0, 0, 0.2);
  --input-text: #0f172a;
  --slot-border: rgba(0, 0, 0, 0.06);
  --slot-focus: rgba(0, 0, 0, 0.03);
  --scrollbar-track: rgba(0, 0, 0, 0.06);
  --scrollbar-thumb: rgba(0, 0, 0, 0.15);
  --scrollbar-thumb-hover: rgba(0, 0, 0, 0.25);
  --progress-track: rgba(0, 0, 0, 0.08);
  --secondary-btn-bg: rgba(0, 0, 0, 0.04);
  --secondary-btn-hover: rgba(0, 0, 0, 0.08);
  --icon-btn-bg: rgba(0, 0, 0, 0.1);
  --icon-btn-border: rgba(0, 0, 0, 0.1);
  --icon-btn-color: #0f172a;
  --icon-btn-hover: rgba(0, 0, 0, 0.15);
  --summary-bg: rgba(255, 255, 255, 0.95);
  --summary-border: rgba(0, 0, 0, 0.1);
  --summary-shadow: rgba(0, 0, 0, 0.15);
  --back-btn-bg: rgba(0, 0, 0, 0.06);
  --back-btn-color: #0f172a;
  --back-btn-hover: rgba(0, 0, 0, 0.1);
  --toast-bg: rgba(255, 255, 255, 0.95);
  --toast-border: rgba(0, 0, 0, 0.1);
  --toast-shadow: rgba(0, 0, 0, 0.15);
  --delete-hover-bg: rgba(239, 68, 68, 0.1);

  /* Toastmasters Colors (shared) */
  --tm-green: #22c55e;
  --tm-amber: #f59e0b;
  --tm-red: #ef4444;

  --transition-speed: 0.5s;
}

body.dark-theme {
  --bg-main: #0f172a;
  --glass: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent: #38bdf8;
  --input-bg: rgba(255, 255, 255, 0.07);
  --input-border: rgba(255, 255, 255, 0.12);
  --input-hover-bg: rgba(255, 255, 255, 0.12);
  --input-hover-border: rgba(255, 255, 255, 0.2);
  --input-text: white;
  --slot-border: rgba(255, 255, 255, 0.05);
  --slot-focus: rgba(255, 255, 255, 0.02);
  --scrollbar-track: rgba(0, 0, 0, 0.1);
  --scrollbar-thumb: rgba(255, 255, 255, 0.2);
  --scrollbar-thumb-hover: rgba(255, 255, 255, 0.3);
  --progress-track: rgba(255, 255, 255, 0.1);
  --secondary-btn-bg: rgba(255, 255, 255, 0.05);
  --secondary-btn-hover: rgba(255, 255, 255, 0.1);
  --icon-btn-bg: rgba(0, 0, 0, 0.2);
  --icon-btn-border: rgba(255, 255, 255, 0.1);
  --icon-btn-color: white;
  --icon-btn-hover: rgba(255, 255, 255, 0.1);
  --summary-bg: rgba(0, 0, 0, 0.9);
  --summary-border: rgba(255, 255, 255, 0.2);
  --summary-shadow: rgba(0, 0, 0, 0.9);
  --back-btn-bg: rgba(255, 255, 255, 0.1);
  --back-btn-color: white;
  --back-btn-hover: rgba(255, 255, 255, 0.2);
  --toast-bg: rgba(15, 23, 42, 0.95);
  --toast-border: rgba(255, 255, 255, 0.15);
  --toast-shadow: rgba(0, 0, 0, 0.5);
  --delete-hover-bg: rgba(239, 68, 68, 0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-primary);
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-speed) ease, color 0.3s;
}

/* Timer active — always use dark background */
body.timer-active {
  background-color: #0f172a;
}

/* Background States */
body.state-green { background-color: var(--tm-green); }
body.state-amber { background-color: var(--tm-amber); }
body.state-red { background-color: var(--tm-red); }
body.state-bell {
  background-color: #0f172a;
  animation: bg-flash 1s infinite;
}

@keyframes bg-flash {
  0%, 49% { background-color: var(--tm-red); }
  50%, 100% { background-color: #0f172a; }
}

/* Main Container */
#app {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  z-index: 10;
}

/* Setup View */
#setup-view {
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  padding: 3rem;
  width: 95%;
  max-width: 1000px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
  transition: opacity 0.3s ease, transform 0.3s ease;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

body.dark-theme #setup-view {
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

#setup-view.hidden {
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  display: none;
}

h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  text-align: center;
  background: linear-gradient(to right, #2563eb, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.dark-theme h1 {
  background: linear-gradient(to right, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

p.subtitle {
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 2rem;
  font-size: 0.875rem;
}

/* Slots Container */
.slots-container {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-height: 50vh;
  overflow-y: auto;
  margin-bottom: 1rem;
  padding-right: 0.5rem;
}

.slots-container::-webkit-scrollbar {
  width: 8px;
}
.slots-container::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
  border-radius: 4px;
}
.slots-container::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}
.slots-container::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

.slot-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.05rem 0;
  border-bottom: 1px solid var(--slot-border);
  transition: background-color 0.2s;
  position: relative;
}

.slot-row:last-child {
  border-bottom: none;
}

.slot-row:focus-within {
  background: var(--slot-focus);
}

.radio-label {
  cursor: pointer;
  display: flex;
  align-items: center;
}

.slot-radio {
  display: none;
}

.custom-radio {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--text-secondary);
  display: inline-block;
  position: relative;
  transition: all 0.2s;
}

.slot-radio:checked + .custom-radio {
  border-color: var(--accent);
}

.slot-radio:checked + .custom-radio::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
}

.slot-fields {
  display: flex;
  flex: 1;
  gap: 0.5rem;
  align-items: center;
}

.slot-role {
  flex: 1.5;
  min-width: 180px;
}

.slot-name {
  flex: 0.8;
  min-width: 100px;
}

.slot-times {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.time-used-col {
  flex: 0.6;
  min-width: 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.4rem;
  opacity: 0.3;
  transition: opacity 0.3s;
}

.time-used-col.has-data {
  opacity: 1;
}

.time-used-col .time-label {
  color: var(--text-secondary);
}

.progress-bg {
  width: 100%;
  height: 8px;
  background: var(--progress-track);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  width: 0%;
  height: 100%;
  background: var(--accent);
  border-radius: 4px;
  transition: width 0.5s ease-out, background-color 0.5s;
}

.time-input-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.time-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
}

.time-input-pair {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.time-input-pair span {
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text-secondary);
}

.time-input-pair input {
  width: 42px !important;
  text-align: center;
  padding: 0.15rem;
  font-size: 0.85rem;
}

input[type="time"], input[type="text"] {
  width: 100%;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  padding: 0.2rem 0.4rem;
  color: var(--input-text);
  font-family: inherit;
  font-size: 0.9rem;
  transition: border-color 0.2s, background-color 0.2s;
}

input[type="text"]:hover, input[type="text"]:focus,
input[type="time"]:hover, input[type="time"]:focus {
  background: var(--input-hover-bg);
  border-color: var(--input-hover-border);
}

input:focus {
  outline: none;
  border-color: var(--accent) !important;
}

.delete-btn {
  width: 32px;
  height: 32px;
  padding: 0.2rem;
  color: var(--text-secondary);
  border-color: transparent !important;
  background: transparent !important;
}

.delete-btn:hover {
  color: var(--tm-red);
  background: var(--delete-hover-bg) !important;
  transform: scale(1.1);
}

.setup-actions {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.secondary-btn {
  width: 100%;
  background: var(--secondary-btn-bg);
  color: var(--text-primary);
  border: 1px dashed var(--glass-border);
  border-radius: 12px;
  padding: 0.65rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s;
}

.secondary-btn:hover {
  background: var(--secondary-btn-hover);
  border-color: var(--text-secondary);
}

#add-slot-btn {
  background: #6366f1; /* Indigo */
  color: white;
  border: none;
}

#add-slot-btn:hover {
  background: #818cf8;
}

button#start-btn {
  width: 100%;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 0.8rem;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s, background-color 0.2s, opacity 0.2s;
}

button#start-btn:hover:not(:disabled) {
  filter: brightness(1.15);
  transform: translateY(-2px);
}

button#start-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Theme Toggle */
#theme-btn {
  flex: 0 0 auto;
  width: auto;
  padding: 0.65rem 0.8rem;
}

/* Timer View */
#timer-view {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

#timer-view.active {
  display: flex;
}

#timer-view {
  --icon-btn-bg: rgba(0, 0, 0, 0.2);
  --icon-btn-border: rgba(255, 255, 255, 0.1);
  --icon-btn-color: white;
  --icon-btn-hover: rgba(255, 255, 255, 0.1);
}

#timer-display {
  font-size: 15vw;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: #f8fafc;
  text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.controls {
  margin-top: 2rem;
  display: flex;
  gap: 1.5rem;
}

.icon-btn {
  background: var(--icon-btn-bg);
  border: 1px solid var(--icon-btn-border);
  color: var(--icon-btn-color);
  padding: 0.75rem;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

.icon-btn:hover {
  background: var(--icon-btn-hover);
  transform: scale(1.1);
}

/* Summary View */
#summary-view {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--summary-bg) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--summary-border);
  border-radius: 24px;
  padding: 3rem;
  width: 100%;
  max-width: 500px;
  box-shadow: 0 25px 50px -12px var(--summary-shadow);
}

#summary-view.active {
  display: flex;
}

#summary-view h1 {
  background: none !important;
  -webkit-background-clip: initial !important;
  -webkit-text-fill-color: var(--text-primary) !important;
  color: var(--text-primary) !important;
  font-size: 2.5rem;
}

#summary-view p.subtitle {
  color: var(--text-primary) !important;
  opacity: 0.9 !important;
}

#total-time-display {
  font-size: 6rem;
  font-weight: 900;
  margin: 1rem 0 2.5rem 0;
  color: var(--text-primary) !important;
  background: none !important;
  -webkit-background-clip: initial !important;
  -webkit-text-fill-color: var(--text-primary) !important;
}

button#back-btn {
  width: 100%;
  background: var(--back-btn-bg);
  color: var(--back-btn-color);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 0.8rem;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

button#back-btn:hover {
  background: var(--back-btn-hover);
}

/* Responsive */
@media (max-width: 850px) {
  #setup-view {
    padding: 2rem;
  }
  .slot-row {
    flex-direction: column;
    align-items: stretch;
    padding: 1.5rem;
  }
  .radio-label {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
  }
  .delete-btn {
    position: absolute;
    top: 0.6rem;
    right: 1.0rem;
  }
  .slot-fields {
    flex-direction: column;
    align-items: stretch;
    margin-top: 2rem;
  }
  .slot-times {
    justify-content: space-between;
    width: 100%;
  }
  .time-used-col {
    margin-top: 1rem;
    width: 100%;
  }
}

@media (max-width: 600px) {
  #timer-display {
    font-size: 25vw;
  }
  .slot-times {
    flex-direction: column;
    gap: 1rem;
    align-items: stretch;
  }
  .time-input-group {
    justify-content: space-between;
  }
}

/* Toast Notification */
#toast-container {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1000;
  pointer-events: none;
}

.toast {
  background: var(--toast-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--toast-border);
  border-radius: 16px;
  padding: 1.5rem 2rem;
  color: var(--text-primary);
  max-width: 520px;
  width: max-content;
  box-shadow: 0 20px 40px var(--toast-shadow), 0 0 0 1px rgba(56, 189, 248, 0.1);
  pointer-events: auto;
  animation: toast-in 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  position: relative;
}

.toast.toast-out {
  animation: toast-out 0.35s cubic-bezier(0.55, 0, 1, 0.45) forwards;
}

.toast h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  background: linear-gradient(to right, #2563eb, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.dark-theme .toast h3 {
  background: linear-gradient(to right, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.toast p {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

.toast p:last-child {
  margin-bottom: 0;
}

.toast strong {
  color: var(--text-primary);
  font-weight: 600;
}

.toast .toast-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
  font-size: 1.1rem;
  transition: color 0.2s;
}

.toast .toast-close:hover {
  color: var(--text-primary);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes toast-out {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
}