/* ==========================================================
   🌿 THEME VARIABLES
   ========================================================== */

/* === Default Theme: Fresh Forest (active) === */
:root {
  --color-primary: #2E7D32;
  --color-primary-light: #66BB6A;
  --color-primary-soft: #A5D6A7;
  --color-primary-bg: #E8F5E9;

  --color-accent: #29B6F6;
  --color-accent-dark: #039BE5;

  --color-success: #2E7D32;
  --color-error: #C62828;
  --color-warning: #FB8C00;

  --color-text: #2E7D32;
  --color-bg: #F9FAF9;
  --color-white: #FFFFFF;
  --shadow-card: 0 2px 6px var(--color-primary-soft);
}

/* === Theme 2: Energetic Sunrise ☀️ === */
/* :root {
  --color-primary: #F57C00;
  --color-primary-light: #FFB74D;
  --color-primary-soft: #FFE0B2;
  --color-primary-bg: #FFF3E0;

  --color-accent: #FF5252;
  --color-accent-dark: #E53935;

  --color-success: #43A047;
  --color-error: #C62828;
  --color-warning: #F9A825;

  --color-text: #4E342E;
  --color-bg: #FFF8E1;
  --color-white: #FFFFFF;
  --shadow-card: 0 2px 6px rgba(255, 183, 77, 0.4);
} */

/* === Theme 3: Cool Mountain 🏔️ === */
/* :root {
  --color-primary: #0277BD;
  --color-primary-light: #58A5F0;
  --color-primary-soft: #BBDEFB;
  --color-primary-bg: #E3F2FD;

  --color-accent: #26C6DA;
  --color-accent-dark: #00ACC1;

  --color-success: #43A047;
  --color-error: #C62828;
  --color-warning: #F9A825;

  --color-text: #0D47A1;
  --color-bg: #F0F8FF;
  --color-white: #FFFFFF;
  --shadow-card: 0 2px 6px rgba(187, 222, 251, 0.5);
} */

/* === Theme 4: Midnight Focus 🌙 === */
/* :root {
  --color-primary: #1E1E2F;
  --color-primary-light: #2C2C4E;
  --color-primary-soft: #3E3E5E;
  --color-primary-bg: #12121C;

  --color-accent: #00E5FF;
  --color-accent-dark: #00B8D4;

  --color-success: #76FF03;
  --color-error: #FF1744;
  --color-warning: #FF9100;

  --color-text: #E0E0E0;
  --color-bg: #0C0C16;
  --color-white: #FFFFFF;
  --shadow-card: 0 2px 6px rgba(0, 0, 0, 0.6);
} */

/* === Theme 5: Desert Energy 🏜️ === */
/* :root {
  --color-primary: #D84315;
  --color-primary-light: #FF7043;
  --color-primary-soft: #FFAB91;
  --color-primary-bg: #FBE9E7;

  --color-accent: #FFD54F;
  --color-accent-dark: #FFC107;

  --color-success: #43A047;
  --color-error: #C62828;
  --color-warning: #FB8C00;

  --color-text: #4E342E;
  --color-bg: #FFF3E0;
  --color-white: #FFFFFF;
  --shadow-card: 0 2px 6px rgba(255, 160, 122, 0.4);
} */

/* ==========================================================
   BASE STRUCTURE
   ========================================================== */
body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

header {
  text-align: center;
  padding: 1rem;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 1.4rem;
  font-weight: bold;
}

header h1 {
  margin: 0;
  font-size: 1.8rem;
  font-weight: bold;
}

header .subtitle {
  margin-top: 0.2rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-primary-soft);
  letter-spacing: 0.5px;
  opacity: 0.9;
  text-shadow: 0 5px 5px rgba(0, 0, 0, 0.2);
}

#app-title {
  display: flex;
  align-items: center;
  justify-content: center; /* center horizontally */
  gap: 10px;
  margin-bottom: 15px;
}

.logo {
  width: 75px;    /* adjust size */
  height: 75px;   /* keep proportional */
}

.title-text {
  font-size: 2em;
  font-weight: bold;
  color: var(--accent-color);
  font-family: var(--font-family, 'Poppins', sans-serif);
}

main {
  display: grid;
  gap: 1rem;
  padding: 1rem;
  grid-template-columns: 1fr;
  max-width: 800px;
  margin: auto;
}

section {
  background: var(--color-white);
  border-radius: 12px;
  box-shadow: var(--shadow-card);
  padding: 1rem;
}

.card {
  background: var(--color-white);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  margin-bottom: 1rem;
}

/* ==========================================================
   BUTTON SYSTEM
   ========================================================== */
.btn {
  display: block;
  width: 100%;
  padding: 0.8rem;
  margin-top: 0.5rem;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  text-align: center;
  transition: background 0.2s ease;
}

.btn:disabled {
  background: var(--color-primary-soft);
  color: #4A4A4A;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-dark);
}

.btn-secondary {
  background: var(--color-primary-light);
  color: var(--color-white);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--color-primary);
}

.btn-danger {
  background: #EF5350;
  color: var(--color-white);
}
.btn-danger:hover:not(:disabled) {
  background: #E53935;
}

/* ==========================================================
   RESPONSIVE LAYOUT
   ========================================================== */
@media (min-width: 700px) {
  main {
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "stats controls"
      "history history";
  }
  #stats { grid-area: stats; }
  #controls { grid-area: controls; }
  #history { grid-area: history; }
}

/* ==========================================================
   SESSION HISTORY
   ========================================================== */
#sessionSummary {
  margin-bottom: 0.8rem;
  padding: 0.5rem;
  background: var(--color-primary-bg);
  border-radius: 6px;
  font-weight: bold;
}

#sessionHistory {
  max-height: 250px;
  overflow-y: auto;
  padding-right: 0.5rem;
}

#sessionHistory p {
  margin: 0.3rem 0;
  padding: 0.4rem;
  border-bottom: 1px solid #eee;
}

/* ==========================================================
   STATUS TEXTS
   ========================================================== */
.status {
  margin-left: 0.5rem;
  font-size: 0.9rem;
  color: #555;
}
.status.loading { color: var(--color-warning); }
.status.success { color: var(--color-success); }
.status.error { color: var(--color-error); }

/* ==========================================================
   OVERLAY POPUP
   ========================================================== */
#overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  transition: opacity 0.3s ease;
}

#overlay.hidden {
  display: none;
}

.overlay-content {
  background: var(--color-white);
  color: var(--color-primary);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  text-align: center;
  width: 80%;
  max-width: 400px;
  animation: popin 0.3s ease;
}

#overlay-buttons {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  margin-top: 1rem;
}

#overlay-buttons button {
  padding: 0.5rem 1.2rem;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

#overlay-confirm,
#overlay-close {
  background: var(--color-primary);
  color: var(--color-white);
}

#overlay-cancel {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.hidden {
  display: none;
}

@keyframes popin {
  from { transform: scale(0.9); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

/* ==========================================================
   LOADING SPINNER
   ========================================================== */
#loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.8);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  font-size: 1.2rem;
  color: var(--color-primary);
}

#loading-overlay.hidden {
  display: none;
}

.spinner {
  border: 4px solid var(--color-primary-soft);
  border-top: 4px solid var(--color-primary);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 1rem auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}