:root {
    --color-bg: #f4f6fb;
    --color-surface: #ffffff;
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-primary-light: #eef2ff;
    --color-text: #1e2433;
    --color-text-muted: #6b7280;
    --color-border: #e5e7eb;
    --color-success: #059669;
    --color-success-bg: #ecfdf5;
    --color-error: #dc2626;
    --color-error-bg: #fef2f2;
    --radius: 14px;
    --radius-sm: 9px;
    --shadow: 0 1px 3px rgba(20, 24, 40, 0.06), 0 4px 14px rgba(20, 24, 40, 0.05);
    --shadow-hover: 0 4px 10px rgba(20, 24, 40, 0.08), 0 10px 30px rgba(20, 24, 40, 0.08);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Vazirmatn", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    direction: rtl;
    line-height: 1.7;
}

.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* -------------------- Topbar -------------------- */
.topbar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 20;
}
.topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.brand {
    font-size: 18px;
    font-weight: 700;
    color: var(--color-primary-dark);
}
.topbar-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}
.user-name {
    color: var(--color-text-muted);
    font-size: 14px;
}

/* -------------------- Content shell -------------------- */
.content {
    flex: 1;
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 32px 28px 60px;
}
.footer {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 13px;
    padding: 20px;
}

/* -------------------- Flash messages -------------------- */
.flash-wrap { margin-bottom: 20px; }
.flash {
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
    font-size: 14px;
}
.flash-error { background: var(--color-error-bg); color: var(--color-error); }
.flash-success { background: var(--color-success-bg); color: var(--color-success); }
.info-banner {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
    font-size: 14px;
}

/* -------------------- Page header -------------------- */
.page-header { margin-bottom: 28px; }
.page-title { font-size: 26px; font-weight: 700; margin: 6px 0 6px; }
.page-subtitle { color: var(--color-text-muted); font-size: 15px; margin: 0; }
.back-link {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
}
.back-link:hover { text-decoration: underline; }

/* -------------------- Buttons -------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-weight: 600;
    font-size: 14px;
    padding: 11px 20px;
    cursor: pointer;
    text-decoration: none;
    transition: all .15s ease;
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-ghost { background: transparent; color: var(--color-text-muted); }
.btn-ghost:hover { background: var(--color-primary-light); color: var(--color-primary-dark); }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-lg { padding: 15px 24px; font-size: 16px; }
.btn-block { width: 100%; }

/* -------------------- Auth pages -------------------- */
.auth-wrap {
    display: flex;
    justify-content: center;
    padding-top: 40px;
}
.auth-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 40px 36px;
    width: 100%;
    max-width: 400px;
    text-align: center;
}
.auth-logo { font-size: 40px; margin-bottom: 10px; }
.auth-title { font-size: 22px; font-weight: 700; margin: 0 0 8px; }
.auth-subtitle { color: var(--color-text-muted); font-size: 14px; margin: 0 0 24px; }
.auth-form { text-align: right; display: flex; flex-direction: column; gap: 6px; }
.field-label { font-size: 13px; color: var(--color-text-muted); margin-top: 10px; }
.field-input {
    font-family: inherit;
    padding: 12px 14px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    outline: none;
    transition: border-color .15s ease;
}
.field-input:focus { border-color: var(--color-primary); }
.auth-form .btn { margin-top: 20px; }

/* -------------------- Student grid (advisor dashboard) -------------------- */
.student-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}
.student-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
    color: inherit;
    transition: box-shadow .15s ease, transform .15s ease;
}
.student-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.student-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}
.student-info { flex: 1; min-width: 0; }
.student-name { font-weight: 700; font-size: 16px; }
.student-meta { color: var(--color-text-muted); font-size: 13px; margin-top: 2px; }
.student-arrow { color: var(--color-text-muted); font-size: 20px; }

.empty-state {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    color: var(--color-text-muted);
    box-shadow: var(--shadow);
}

/* -------------------- Weekly schedule grid (advisor) -------------------- */
.week-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(220px, 1fr));
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 10px;
}
.day-column {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
    display: flex;
    flex-direction: column;
    min-height: 320px;
}
.day-title {
    font-size: 15px;
    font-weight: 700;
    margin: 0 0 12px;
    color: var(--color-primary-dark);
    text-align: center;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
}
.part-list { flex: 1; display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.day-empty { color: var(--color-text-muted); font-size: 13px; text-align: center; padding: 20px 0; }

.part-card {
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    position: relative;
}
.part-card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 6px; }
.part-subject { font-weight: 700; font-size: 14px; color: var(--color-primary-dark); }
.part-hours { font-size: 12px; color: var(--color-text-muted); white-space: nowrap; }
.part-desc { font-size: 12.5px; color: var(--color-text-muted); margin-top: 4px; line-height: 1.5; }
.btn-icon-delete {
    position: absolute;
    top: 6px;
    left: 6px;
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    font-size: 13px;
    padding: 2px 6px;
    border-radius: 6px;
    opacity: 0;
    transition: opacity .15s ease, color .15s ease, background .15s ease;
}
.part-card:hover .btn-icon-delete { opacity: 1; }
.btn-icon-delete:hover { color: var(--color-error); background: var(--color-error-bg); }
.part-delete-form { display: inline; }

.add-part-form {
    display: flex;
    flex-direction: column;
    gap: 6px;
    border-top: 1px dashed var(--color-border);
    padding-top: 12px;
}
.mini-input, .mini-textarea {
    font-family: inherit;
    padding: 8px 10px;
    border: 1.5px solid var(--color-border);
    border-radius: 8px;
    font-size: 13px;
    outline: none;
    width: 100%;
    resize: vertical;
}
.mini-input:focus, .mini-textarea:focus { border-color: var(--color-primary); }
.mini-input-num { text-align: center; }

/* -------------------- Student report page -------------------- */
.report-list { display: flex; flex-direction: column; gap: 14px; margin-bottom: 24px; }
.report-item {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 18px 20px;
}
.report-item-head {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 15px;
}
.report-item-head input[type="checkbox"] { width: 19px; height: 19px; accent-color: var(--color-primary); cursor: pointer; }
.report-subject { font-weight: 700; }
.report-planned { color: var(--color-text-muted); font-size: 13px; }
.report-desc { color: var(--color-text-muted); font-size: 13.5px; margin: 8px 0 0 29px; }
.report-inputs {
    display: flex;
    gap: 16px;
    margin-top: 12px;
    padding-right: 29px;
    flex-wrap: wrap;
}
.report-input-group { display: flex; flex-direction: column; gap: 4px; min-width: 130px; }
.report-input-group-wide { flex: 1; min-width: 220px; }
.report-input-group label { font-size: 12.5px; color: var(--color-text-muted); }

/* -------------------- Responsive -------------------- */
@media (max-width: 900px) {
    .week-grid { grid-template-columns: 1fr; }
    .topbar-inner, .content { padding-left: 16px; padding-right: 16px; }
}