@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');


:root {
    --bg:            #0d1117;
    --surface:       #161b27;
    --surface-2:     #1e2535;
    --surface-3:     #252d40;
    --border:        #2a3248;
    --text:          #e6eaf7;
    --text-muted:    #7b85aa;
    --text-faint:    #4a5270;
    --primary:       #00c9d4;
    --primary-hover: #00adb7;
    --primary-dim:   rgba(0, 201, 212, 0.12);
    --primary-glow:  0 0 18px rgba(0, 201, 212, 0.25);
    --danger:        #ff5c5c;
    --danger-dim:    rgba(255, 92, 92, 0.12);
    --success:       #3dd68c;
    --google-bg:     #2a2f45;
    --google-hover:  #323854;
    --radius-lg:     18px;
    --radius-md:     12px;
    --radius-sm:     8px;
    --shadow-card:   0 8px 32px rgba(0, 0, 0, 0.45);
    --shadow-btn:    0 4px 14px rgba(0, 201, 212, 0.3);
    --transition:    0.22s ease;
    --header-h:      60px;
}

/* ── Light Mode ── */
body.light {
    --bg:            #f0f4ff;
    --surface:       #ffffff;
    --surface-2:     #f5f7fe;
    --surface-3:     #eaeef9;
    --border:        #d8dff2;
    --text:          #1a1f36;
    --text-muted:    #5b6589;
    --text-faint:    #9ba3c0;
    --primary:       #0099a8;
    --primary-hover: #00808e;
    --primary-dim:   rgba(0, 153, 168, 0.1);
    --primary-glow:  0 0 18px rgba(0, 153, 168, 0.2);
    --danger:        #e53935;
    --danger-dim:    rgba(229, 57, 53, 0.1);
    --success:       #2e9c68;
    --google-bg:     #f0f4ff;
    --google-hover:  #e3e9f9;
    --shadow-card:   0 4px 24px rgba(26, 31, 54, 0.08);
    --shadow-btn:    0 4px 14px rgba(0, 153, 168, 0.25);
}

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

/* ── Base ── */
body {
    font-family: 'Inter', 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 15px;
    line-height: 1.55;
    transition: background var(--transition), color var(--transition);
    min-height: 100vh;
}

/* ============================================================
   HEADER
   ============================================================ */

.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    backdrop-filter: blur(10px);
}

.header-brand {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.3px;
}

.header-brand span {
    font-size: 22px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-icon {
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    padding: 7px 14px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    width: auto;
    margin: 0;
}

.btn-icon:hover {
    background: var(--surface-3);
    color: var(--text);
    transform: none;
    box-shadow: none;
}

.btn-icon:active {
    transform: scale(0.97);
}

/* ============================================================
   AUTH PAGES (login / register)
   ============================================================ */

.auth-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
}

.auth-brand {
    text-align: center;
    margin-bottom: 28px;
}

.auth-brand .brand-icon {
    font-size: 42px;
    display: block;
    margin-bottom: 8px;
}

.auth-brand h1 {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.4px;
}

.auth-brand p {
    font-size: 14px;
    color: var(--text-muted);
    margin-top: 4px;
}

.auth-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-card);
    animation: slideUp 0.35s ease;
}

.auth-card h2 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text);
}

.input-group {
    margin-bottom: 14px;
}

.input-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 16px 0;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.auth-divider span {
    font-size: 12px;
    color: var(--text-faint);
    font-weight: 500;
    white-space: nowrap;
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* ============================================================
   DASHBOARD LAYOUT
   ============================================================ */

.page-body {
    padding: 20px 16px 40px;
    max-width: 460px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* ============================================================
   CARDS
   ============================================================ */

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 22px 20px;
    box-shadow: var(--shadow-card);
    animation: slideUp 0.35s ease both;
    transition: border-color var(--transition);
}

.card:hover {
    border-color: var(--primary-dim);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.card-icon {
    font-size: 20px;
    width: 36px;
    height: 36px;
    background: var(--primary-dim);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.card-header h2 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.2px;
    flex: 1;           /* pushes any action button to the right */
}

/* Stagger animation */
.card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2) { animation-delay: 0.10s; }
.card:nth-child(3) { animation-delay: 0.15s; }
.card:nth-child(4) { animation-delay: 0.20s; }
.card:nth-child(5) { animation-delay: 0.25s; }
.card:nth-child(6) { animation-delay: 0.30s; }

/* ============================================================
   PROFILE CARD
   ============================================================ */

/* Edit button in card-header */
.btn-edit-profile {
    font-size: 12px;
    font-weight: 600;
    padding: 5px 12px;
    border-radius: 99px;
    background: var(--surface-3);
    border: 1px solid var(--border);
    color: var(--text-muted);
    cursor: pointer;
    transition: background var(--transition), color var(--transition), border-color var(--transition);
    white-space: nowrap;
    flex-shrink: 0;
}

.btn-edit-profile:hover {
    background: var(--primary-dim);
    border-color: var(--primary);
    color: var(--primary);
}

/* Profile view row */
.profile-row {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Avatar circle with initials */
.profile-avatar {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary), #005f88);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    letter-spacing: -0.5px;
    flex-shrink: 0;
    box-shadow: 0 4px 14px rgba(0, 201, 212, 0.3);
    transition: transform var(--transition);
}

.profile-avatar:hover {
    transform: scale(1.06);
}

.profile-info {
    flex: 1;
    min-width: 0;
}

.profile-display-name {
    font-weight: 700;
    font-size: 17px;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

.profile-class-school {
    font-size: 13px;
    font-weight: 500;
    color: var(--primary);
    margin-top: 3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.profile-email {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 3px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Edit profile form */
.btn-edit-profile {
    width: auto;              /* stops full width madness */
    padding: 5px 10px;        /* smaller size */
    font-size: 13px;          /* compact text */
    border-radius: 6px;
    background: #2a2a2a;
    color: white;
    cursor: pointer;
    margin-left: auto;        /* push to right */
    display: inline-block;
}

.btn-edit-profile:hover {
    background: #3a3a3a;
}

/* Two-column row for register + edit forms */
.reg-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

/* Required / optional label markers */
.req {
    color: var(--danger);
    font-weight: 700;
}

.opt {
    color: var(--text-faint);
    font-weight: 400;
    font-size: 11px;
}

/* Wider auth card for registration */
.reg-card {
    max-width: 520px;
    overflow-y: auto;
    max-height: 92vh;
}

/* ============================================================
   INPUTS & TEXTAREA
   ============================================================ */

input[type="text"],
input[type="email"],
input[type="password"],
textarea,
select {
    width: 100%;
    padding: 11px 14px;
    background: var(--surface-2);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text);
    font-family: inherit;
    font-size: 14px;
    outline: none;
    transition: border-color var(--transition), background var(--transition);
    margin: 0;
}

input::placeholder,
textarea::placeholder {
    color: var(--text-faint);
}

input:focus,
textarea:focus {
    border-color: var(--primary);
    background: var(--surface);
}

textarea {
    resize: vertical;
    min-height: 110px;
}

/* Task input row */
.task-row {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
}

.task-row input {
    flex: 1;
}

.task-row .btn-sm {
    flex-shrink: 0;
    width: auto;
    padding: 11px 16px;
    margin: 0;
    white-space: nowrap;
    font-size: 13px;
}

/* ============================================================
   BUTTONS
   ============================================================ */

button {
    width: 100%;
    padding: 12px 16px;
    border: none;
    border-radius: var(--radius-md);
    background: var(--primary);
    color: #fff;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    margin-top: 10px;
    letter-spacing: 0.1px;
}

button:hover {
    background: var(--primary-hover);
    box-shadow: var(--shadow-btn);
    transform: translateY(-1px);
}

button:active {
    transform: scale(0.97);
    box-shadow: none;
}

/* Google button */
.btn-google {
    background: var(--google-bg);
    color: var(--text);
    border: 1.5px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
}

.btn-google:hover {
    background: var(--google-hover);
    box-shadow: none;
}

.btn-google .g-icon {
    font-size: 16px;
}

/* Secondary / outline button */
.btn-secondary {
    background: var(--surface-2);
    color: var(--text);
    border: 1.5px solid var(--border);
}

.btn-secondary:hover {
    background: var(--surface-3);
    box-shadow: none;
}

/* Danger button */
.btn-danger {
    background: var(--danger-dim);
    color: var(--danger);
    border: 1.5px solid transparent;
}

.btn-danger:hover {
    background: var(--danger);
    color: #fff;
    box-shadow: 0 4px 14px rgba(255, 92, 92, 0.3);
}

/* ============================================================
   TASK LIST
   ============================================================ */

#taskList {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

#taskList li {
    background: var(--surface-2);
    border: 1px solid var(--border);
    padding: 11px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
}

#taskList li::before {
    content: '○';
    font-size: 14px;
    color: var(--text-faint);
    flex-shrink: 0;
    transition: var(--transition);
}

#taskList li:hover {
    background: var(--surface-3);
    border-color: var(--primary);
}

#taskList li:hover::before {
    content: '✓';
    color: var(--primary);
}

#taskList li.done {
    opacity: 0.5;
    text-decoration: line-through;
    color: var(--text-muted);
}

#taskList li.done::before {
    content: '✓';
    color: var(--success);
}

#taskList:empty::after {
    content: 'No tasks yet. Add one above!';
    display: block;
    color: var(--text-faint);
    font-size: 13px;
    text-align: center;
    padding: 16px 0 4px;
}

/* ============================================================
   POMODORO TIMER
   ============================================================ */

.timer-display {
    text-align: center;
    padding: 18px 0 14px;
}

.timer-display #timer {
    font-size: 52px;
    font-weight: 700;
    letter-spacing: -2px;
    color: var(--primary);
    display: block;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}

.timer-label {
    font-size: 12px;
    color: var(--text-faint);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 6px;
}

.timer-buttons {
    display: flex;
    gap: 10px;
}

.timer-buttons button {
    flex: 1;
    margin-top: 0;
}

.timer-buttons .btn-secondary {
    flex: 0 0 auto;
    width: 48px;
    padding: 12px;
}

/* ============================================================
   TIMETABLE
   ============================================================ */

.timetable-note {
    font-size: 12px;
    color: var(--text-faint);
    margin-top: 8px;
}

/* ============================================================
   PROGRESS
   ============================================================ */

.progress-item {
    margin-bottom: 14px;
}

.progress-item:last-of-type {
    margin-bottom: 0;
}

.progress-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.progress-label-row span {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
}

.progress-label-row .pct {
    font-size: 13px;
    font-weight: 600;
    color: var(--primary);
}

progress {
    width: 100%;
    height: 8px;
    border-radius: 99px;
    border: none;
    background: var(--surface-2);
    overflow: hidden;
    appearance: none;
    -webkit-appearance: none;
}

progress::-webkit-progress-bar {
    background: var(--surface-2);
    border-radius: 99px;
}

progress::-webkit-progress-value {
    background: linear-gradient(90deg, var(--primary), #00e5d0);
    border-radius: 99px;
    transition: width 0.6s ease;
}

progress::-moz-progress-bar {
    background: linear-gradient(90deg, var(--primary), #00e5d0);
    border-radius: 99px;
}

.chart-wrap {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

/* ============================================================
   NOTIFICATIONS CARD
   ============================================================ */

.notif-info {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 12px;
    line-height: 1.5;
}

/* ============================================================
   ANIMATIONS
   ============================================================ */

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* ============================================================
   LINKS
   ============================================================ */

a {
    color: var(--primary);
    text-decoration: none;
    transition: opacity var(--transition);
}

a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* ============================================================
   SUBJECTS
   ============================================================ */

/* Add-subject form */
.add-subject-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-bottom: 18px;
}

.add-subject-form input {
    margin: 0;
}

/* Reminder time field — spans full width */
.reminder-field {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--surface-2);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    padding: 9px 12px;
    transition: border-color var(--transition);
}

.reminder-field:focus-within {
    border-color: var(--primary);
}

.reminder-field label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 5px;
    white-space: nowrap;
    flex-shrink: 0;
}

.reminder-field input[type="time"] {
    flex: 1;
    background: transparent;
    border: none;
    padding: 0;
    margin: 0;
    color: var(--text);
    font-size: 14px;
    font-weight: 500;
    outline: none;
    min-width: 0;
}

.reminder-field input[type="time"]::-webkit-calendar-picker-indicator {
    filter: invert(0.5);
    cursor: pointer;
}

.btn-add-subject {
    grid-column: 1 / -1;
    margin: 0;
}

/* Reminder badge on subject card */
.subject-badges {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.reminder-badge {
    font-size: 11px;
    font-weight: 600;
    color: #f59e0b;
    background: rgba(245, 158, 11, 0.12);
    border: 1px solid rgba(245, 158, 11, 0.2);
    padding: 2px 8px;
    border-radius: 99px;
    white-space: nowrap;
}

/* Subject list empty state */
.empty-msg {
    color: var(--text-faint);
    font-size: 13px;
    text-align: center;
    padding: 20px 0 8px;
    line-height: 1.5;
}

/* Individual subject item */
.subject-item {
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 12px;
    transition: border-color var(--transition), box-shadow var(--transition);
    animation: slideUp 0.3s ease both;
}

.subject-item:last-child {
    margin-bottom: 0;
}

.subject-item:hover {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-dim);
}

.subject-item-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
    gap: 8px;
}

.subject-name-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.subject-item-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
}

.subject-item-pct {
    font-size: 13px;
    font-weight: 700;
    color: var(--primary);
    background: var(--primary-dim);
    padding: 2px 9px;
    border-radius: 99px;
    white-space: nowrap;
}

.subject-item-pct.done {
    color: var(--success);
    background: rgba(61, 214, 140, 0.12);
}

.subject-progress-row {
    margin-bottom: 8px;
}

.subject-progress-row progress {
    width: 100%;
}

.subject-item-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.badge-done {
    color: var(--success);
    font-weight: 600;
    font-size: 12px;
}

/* Delete subject button */
.btn-delete-subject {
    width: auto;
    padding: 3px 7px;
    margin: 0;
    font-size: 13px;
    background: transparent;
    color: var(--text-faint);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.btn-delete-subject:hover {
    background: var(--danger-dim);
    color: var(--danger);
    border-color: transparent;
    box-shadow: none;
    transform: none;
}

.btn-delete-subject:active {
    transform: scale(0.94);
}

/* Complete lesson button */
.btn-complete {
    width: 100%;
    margin: 0;
    padding: 9px 14px;
    font-size: 13px;
    font-weight: 600;
}

.btn-complete:disabled,
.btn-done {
    background: rgba(61, 214, 140, 0.12) !important;
    color: var(--success) !important;
    cursor: default;
    box-shadow: none !important;
    transform: none !important;
    border: 1px solid rgba(61, 214, 140, 0.25);
}

/* ============================================================
   CHART
   ============================================================ */

.chart-container {
    position: relative;
    max-width: 280px;
    margin: 0 auto 10px;
}

.chart-hint {
    text-align: center;
    font-size: 12px;
    color: var(--text-faint);
    margin-top: 4px;
}

/* ============================================================
   SCROLLBAR
   ============================================================ */

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-faint); }

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 480px) {
    .page-body { padding: 14px 12px 36px; gap: 12px; }
    .auth-card  { padding: 24px 18px; }
    .timer-display #timer { font-size: 44px; }
    .header-brand { font-size: 15px; }
}