/* StudyFlow — Main Styles */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 30px 18px;
  background: #f7f5ff;
  color: #25213f;
  font-family: Arial, sans-serif;
  line-height: 1.6;
}

.container {
  max-width: 750px;
  margin: 0 auto;
}

/* Header */

.site-header {
  margin-bottom: 28px;
}

.eyebrow {
  color: #7864c8;
  font-size: 12px;
  font-weight: bold;
  letter-spacing: 2px;
}

h1 {
  font-size: 38px;
  margin: 4px 0;
  letter-spacing: -1px;
}

h2 {
  font-size: 21px;
  margin-top: 0;
}

.subtitle,
.section-description {
  color: #6b7280;
  font-size: 14px;
}

.section-description {
  margin-top: -8px;
  margin-bottom: 22px;
}

/* Weekly total */

.weekly-card {
  background: linear-gradient(135deg, #7864c8, #a78bfa);
  color: white;
  border-radius: 18px;
  padding: 30px;
  margin-bottom: 24px;
  box-shadow: 0 8px 24px rgba(120, 100, 200, 0.18);
}

.card-label {
  font-size: 12px;
  font-weight: bold;
  letter-spacing: 1.5px;
}

.weekly-card h2 {
  font-size: 42px;
  margin: 10px 0;
}

.weekly-card p:last-child {
  opacity: 0.9;
  margin-bottom: 0;
}

/* Cards */

.card {
  background: #ffffff;
  border-radius: 18px;
  padding: 28px;
  margin-bottom: 30px;
  box-shadow: 0 5px 20px rgba(80, 60, 140, 0.07);
}

/* Form */

.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 18px;
}

label {
  font-size: 14px;
  font-weight: bold;
  margin-bottom: 7px;
}

input,
select {
  font-family: inherit;
  font-size: 15px;
  padding: 13px;
  border: 1px solid #ddd8ee;
  border-radius: 10px;
  background: #faf9ff;
  color: #25213f;
}

input:focus,
select:focus {
  outline: 2px solid #a78bfa;
  border-color: #7864c8;
}

input.invalid {
  border-color: #dc2626;
}

.error {
  color: #dc2626;
  font-size: 13px;
  min-height: 18px;
  margin-top: 4px;
}

/* Buttons */

button {
  font-family: inherit;
  cursor: pointer;
  transition: 0.2s;
}

.primary-button {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 10px;
  background: #7864c8;
  color: white;
  font-size: 16px;
  font-weight: bold;
}

.primary-button:hover {
  background: #6550b5;
  transform: translateY(-1px);
}

/* Subject summary */

.summary-section {
  margin-bottom: 32px;
}

.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
}

.subject-card {
  background: white;
  border-radius: 15px;
  padding: 22px;
  box-shadow: 0 4px 15px rgba(80, 60, 140, 0.06);
}

.subj-name {
  color: #6b7280;
  font-size: 13px;
  font-weight: bold;
  text-transform: uppercase;
}

.subj-total {
  color: #7864c8;
  font-size: 26px;
  font-weight: bold;
  margin-top: 8px;
}

/* Empty states */

.empty-state {
  border: 2px dashed #d8cff4;
  background: #ffffff;
  color: #858096;
  padding: 30px 20px;
  border-radius: 14px;
  text-align: center;
  font-size: 14px;
}

/* Study history */

.history-section {
  margin-bottom: 35px;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 15px;
}

.history-controls {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.history-controls label {
  font-size: 12px;
  color: #6b7280;
}

#session-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.session-row {
  background: white;
  padding: 18px 20px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: 0 4px 15px rgba(80, 60, 140, 0.06);
}

.session-info {
  display: flex;
  flex-direction: column;
}

.session-subject {
  font-weight: bold;
  font-size: 16px;
}

.session-meta {
  color: #6b7280;
  font-size: 13px;
}

.btn-delete {
  background: #fff0f0;
  color: #dc2626;
  border: none;
  border-radius: 8px;
  padding: 9px 13px;
  font-weight: bold;
}

.btn-delete:hover {
  background: #ffe0e0;
}

/* Reset */

.reset-button {
  margin-top: 22px;
  padding: 12px 20px;
  border: 1px solid #dc2626;
  border-radius: 10px;
  color: #dc2626;
  background: white;
  font-weight: bold;
}

.reset-button:hover {
  background: #fff0f0;
}

.confirmation {
  margin-top: 15px;
  padding: 20px;
  background: white;
  border: 1px solid #f0caca;
  border-radius: 12px;
}

.confirmation[hidden] {
  display: none;
}

.confirmation-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

#confirm-reset,
#cancel-reset {
  border-radius: 8px;
  padding: 10px 15px;
  font-weight: bold;
}

#confirm-reset {
  background: #dc2626;
  color: white;
  border: none;
}

#cancel-reset {
  background: white;
  border: 1px solid #ddd8ee;
  color: #25213f;
}

/* Footer */

footer {
  text-align: center;
  color: #858096;
  font-size: 13px;
  padding: 20px 0;
}

/* Mobile */

@media (max-width: 600px) {
  body {
    padding: 18px 12px;
  }

  h1 {
    font-size: 30px;
  }

  .weekly-card h2 {
    font-size: 34px;
  }

  .card {
    padding: 20px;
  }

  .history-header {
    align-items: stretch;
  }

  .subject-grid {
    grid-template-columns: 1fr;
  }
}