/* === Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* === Design Tokens (Dark Mode default) === */
:root {
  --bg:         #0f0f17;
  --surface:    #1a1a2e;
  --surface2:   #242438;
  --text:       #e2e2f0;
  --text-muted: #7a7a9a;
  --border:     rgba(255,255,255,0.08);
  --header-bg:  #12122a;
  --shadow:     0 4px 16px rgba(0,0,0,0.6);

  /* Event gradients */
  --axa-bg:      linear-gradient(160deg, #1565c0 0%, #1e88e5 100%);
  --mainframe-bg:linear-gradient(160deg, #6a1b9a 0%, #ab47bc 100%);
  --ctf-bg:      linear-gradient(160deg, #b71c1c 0%, #ef5350 100%);
  --ml-bg:       linear-gradient(160deg, #00695c 0%, #26a69a 100%);
  --ptp-bg:      linear-gradient(160deg, #2e7d32 0%, #66bb6a 100%);
  --webdev-bg:   linear-gradient(160deg, #283593 0%, #5c6bc0 100%);
  --erp-bg:      linear-gradient(160deg, #bf360c 0%, #ff7043 100%);
  --comnet-bg:   linear-gradient(160deg, #006064 0%, #26c6da 100%);
  --english-bg:  linear-gradient(160deg, #4a148c 0%, #ce93d8 100%);

  /* Time grid: 1.5 px per minute, 6:00–19:00 = 780 min */
  --scale:      1.5px;
  --day-height: 1170px;
}

/* Light mode — applied by JS via class when toggle is used or prefers-color-scheme:light */
:root.light {
  --bg:         #f0f0f8;
  --surface:    #ffffff;
  --surface2:   #e4e4f0;
  --text:       #1a1a2e;
  --text-muted: #5a5a7a;
  --border:     rgba(0,0,0,0.08);
  --header-bg:  #12122a;
  --shadow:     0 4px 16px rgba(0,0,0,0.15);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

/* === Header === */
header {
  background: var(--header-bg);
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 12px rgba(0,0,0,0.5);
  position: sticky;
  top: 0;
  z-index: 200;
}

header h1 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #e0e0f4;
  letter-spacing: 0.04em;
}

.theme-btn {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  font-size: 1rem;
  cursor: pointer;
  color: #e0e0f4;
  transition: background 0.2s;
}
.theme-btn:hover { background: rgba(255,255,255,0.2); }

/* === DESKTOP SCHEDULE === */
.desktop-schedule {
  padding: 1.25rem 1.5rem 2rem;
  overflow-x: auto;
}

/* Grid: time-axis col + 5 day cols */
.day-headers,
.schedule-body {
  display: grid;
  grid-template-columns: 52px repeat(5, 1fr);
  min-width: 580px;
  gap: 0 6px;
  position: sticky;
}

.day-headers {
  margin-bottom: 6px;
}

.day-header-cell {
  background: var(--surface2);
  text-align: center;
  padding: 0.5rem 0.25rem;
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 8px;
  letter-spacing: 0.03em;
}

/* Time axis */
.time-axis {
  position: relative;
  height: var(--day-height);
  flex-shrink: 0;
}

.time-label {
  position: absolute;
  right: 4px;
  font-size: 0.65rem;
  color: var(--text-muted);
  transform: translateY(-50%);
  white-space: nowrap;
  user-select: none;
}

/* Day track (content column) */
.day-track {
  position: relative;
  height: var(--day-height);
  background: var(--surface);
  border-radius: 8px;
  /* Subtle hour lines every 90px (= 60 min × 1.5px) */
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent calc(90px - 1px),
    var(--border) calc(90px - 1px),
    var(--border) 90px
  );
  overflow: hidden;
}

/* Event block */
.event {
  position: absolute;
  left: 5px;
  right: 5px;
  border-radius: 7px;
  padding: 6px 9px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  cursor: default;
}
.event:hover {
  transform: scale(1.025);
  box-shadow: 0 6px 18px rgba(0,0,0,0.5);
  z-index: 10;
}

.event-name {
  font-weight: 700;
  font-size: 0.82rem;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.3;
  position: sticky;
}
.event-time {
  font-size: 0.68rem;
  color: rgba(255,255,255,0.78);
  margin-top: 2px;
  position: sticky;
}

/* === Event colour classes === */
.ev-axa      { background: var(--axa-bg); }
.ev-mainframe{ background: var(--mainframe-bg); }
.ev-ctf      { background: var(--ctf-bg); }
.ev-ml       { background: var(--ml-bg); }
.ev-ptp      { background: var(--ptp-bg); }
.ev-webdev   { background: var(--webdev-bg); }
.ev-erp      { background: var(--erp-bg); }
.ev-comnet   { background: var(--comnet-bg); }
.ev-english  { background: var(--english-bg); }

/* === MOBILE SCHEDULE === */
.mobile-schedule {
  display: none;
  padding: 1rem;
  flex-direction: column;
  gap: 0.85rem;
}

.day-card {
  background: var(--surface);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.day-card-header {
  background: var(--surface2);
  padding: 0.7rem 1rem;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.event-list {
  padding: 0.6rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.event-item {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.6rem 0.85rem;
  border-radius: 9px;
}

.time-badge {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.85);
  white-space: nowrap;
  min-width: 100px;
  font-feature-settings: "tnum";
}

.subject {
  font-weight: 600;
  font-size: 0.9rem;
  color: #fff;
}

/* === Responsive breakpoint === */
@media screen and (max-width: 768px) {
  .desktop-schedule { display: none; }
  .mobile-schedule  { display: flex; }
}
.form-container {
   display: flex;
   flex-direction: column;
   gap: 1rem;
   padding: 1.5rem;
   max-width: 600px;
   margin: 0 auto;
}

#submit:disabled {
   opacity: 0.55;
   cursor: not-allowed;
}

/* === REGISTRATION FORM STYLES === */
.registration-form {
   display: flex;
   flex-direction: column;
   gap: 1.5rem;
}

.form-group {
   display: flex;
   flex-direction: column;
   gap: 0.5rem;
}

.form-group label {
   font-weight: 600;
   font-size: 0.95rem;
   color: var(--text);
   letter-spacing: 0.01em;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group select,
.form-group textarea {
   padding: 0.75rem 1rem;
   border: 2px solid var(--border);
   border-radius: 8px;
   background: var(--surface);
   color: var(--text);
   font-size: 1rem;
   font-family: inherit;
   transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group textarea {
   resize: vertical;
   min-height: 120px;
   line-height: 1.45;
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group input[type="password"]:focus,
.form-group select:focus,
.form-group textarea:focus {
   outline: none;
   border-color: #5c6bc0;
   box-shadow: 0 0 0 3px rgba(92, 107, 192, 0.1);
}

.form-group input::placeholder {
   color: var(--text-muted);
}

/* File Input Styling */
.file-input-wrapper {
   position: relative;
   overflow: hidden;
   border: 2px dashed var(--border);
   border-radius: 8px;
   padding: 1.5rem 1rem;
   text-align: center;
   background: var(--surface2);
   cursor: pointer;
   transition: border-color 0.2s, background 0.2s;
}

.file-input-wrapper:hover {
   border-color: #5c6bc0;
   background: rgba(92, 107, 192, 0.05);
}

.file-input-wrapper.is-dragover {
   border-color: #5c6bc0;
   background: rgba(92, 107, 192, 0.14);
}

.file-input-wrapper.is-invalid {
   border-color: #ef5350;
   background: rgba(239, 83, 80, 0.08);
}

.file-input-wrapper input[type="file"] {
   position: absolute;
   opacity: 0;
   width: 100%;
   height: 100%;
   cursor: pointer;
   top: 0;
   left: 0;
}

.file-name {
   display: block;
   font-size: 0.9rem;
   color: var(--text-muted);
   pointer-events: none;
}

.file-hint {
   display: block;
   margin-top: 0.35rem;
   font-size: 0.78rem;
   color: var(--text-muted);
   pointer-events: none;
}

.file-input-wrapper.has-file .file-name {
   color: var(--text);
   font-weight: 600;
}

/* Checkbox Group for Hobbies */
.checkbox-group {
   display: flex;
   flex-direction: column;
   gap: 0.75rem;
   padding: 1rem;
   background: var(--surface2);
   border-radius: 8px;
   border: 2px solid var(--border);
}

.checkbox-label {
   display: flex;
   align-items: center;
   gap: 0.65rem;
   cursor: pointer;
   font-size: 0.95rem;
   color: var(--text);
   transition: color 0.2s;
}

.checkbox-label:hover {
   color: #5c6bc0;
}

.checkbox-label input[type="checkbox"],
.checkbox-label input[type="checkbox"] {
   width: 20px;
   height: 20px;
   cursor: pointer;
   accent-color: #5c6bc0;
}

/* Terms Checkbox */
.checkbox-terms {
   padding: 1rem;
   background: var(--surface2);
   border-radius: 8px;
   border: 2px solid var(--border);
}

.terms-link {
   color: #5c6bc0;
   text-decoration: none;
   transition: text-decoration 0.2s;
}

.terms-link:hover {
   text-decoration: underline;
}

/* Error Message */
.error-message {
   font-size: 0.85rem;
   color: #ef5350;
   min-height: 1.2em;
   display: block;
}

/* Submit Button */

.submit-btn {
    background: linear-gradient(160deg, #283593 0%, #5c6bc0 100%);
}.reset-btn {
    background: linear-gradient(160deg, #932828 0%, #c05c5c 100%);
}
.submit-btn, .reset-btn {
    padding: 0.85rem 2rem;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
    letter-spacing: 0.04em;
    margin-top: 0;
}

.form-actions {
   display: flex;
   gap: 0.75rem;
   margin-top: 1rem;
}

.form-actions .submit-btn,
.form-actions .reset-btn {
   flex: 1;
}
.submit-btn:hover, .reset-btn:hover {
   transform: translateY(-2px);
   box-shadow: 0 6px 20px rgba(92, 107, 192, 0.35);
}

.submit-btn:active, .reset-btn:active {
   transform: translateY(0);
}

.submit-btn:disabled, .reset-btn:disabled {
   opacity: 0.6;
   cursor: not-allowed;
   transform: none;
}

/* Form Link at bottom */
.form-link {
   display: inline-block;
   padding: 0.75rem 1.5rem;
   margin: 1rem 1.5rem 1.5rem;
   background: var(--surface2);
   color: var(--text);
   text-decoration: none;
   border-radius: 8px;
   border: 2px solid var(--border);
   transition: all 0.2s;
}

.form-link:hover {
   border-color: #5c6bc0;
   color: #5c6bc0;
}

/* === Responsive Breakpoints === */
@media screen and (max-width: 768px) {
   .form-container {
      padding: 1rem;
      max-width: 100%;
   }

   .form-group {
      gap: 0.4rem;
   }

   .checkbox-group {
      gap: 0.6rem;
      padding: 0.85rem;
   }

   .submit-btn, .reset-btn{
      font-size: 0.95rem;
      padding: 0.75rem 1.5rem;
   }

   .form-actions {
      flex-direction: column;
      gap: 0.65rem;
   }
}

@media screen and (max-width: 480px) {
   .form-container {
      padding: 0.75rem;
   }

   .form-group label {
      font-size: 0.9rem;
   }

   .form-group input[type="text"],
   .form-group input[type="email"],
   .form-group input[type="password"],
      .form-group select,
      .form-group textarea {
      font-size: 16px; /* Prevents zoom on mobile */
   }
}

.hobbies{
    overflow: scroll;
    height: 150px;
}