/* Nexus (Kurumsal Proje Takip Sistemi) — temel tasarım sistemi (Bölüm 10) */

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #eff6ff;
    --color-bg: #f4f5f7;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-border-strong: #d1d5db;
    --color-text: #1f2937;
    --color-text-muted: #6b7280;
    --color-text-faint: #9ca3af;
    --color-danger: #dc2626;
    --color-success: #16a34a;
    --color-warning: #d97706;
    --radius: 10px;
    --radius-sm: 6px;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 16px;
    --space-4: 24px;
    --space-5: 32px;
    --sidebar-width: 244px;
    --topbar-height: 60px;
    --shadow-sm: 0 1px 2px rgba(16, 24, 40, .05);
    --shadow-md: 0 4px 16px rgba(16, 24, 40, .08);
    --shadow-lg: 0 12px 32px rgba(16, 24, 40, .14);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 15px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.3; }

/* =============================================================================
   Uygulama kabuğu: sabit sol menü + üst bar + içerik
   ========================================================================== */

.app-shell {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background: #14213d;
    color: #cbd5e1;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 40;
    transition: transform .2s ease;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 0 var(--space-4);
    height: var(--topbar-height);
    font-weight: 700;
    font-size: 18px;
    color: #ffffff;
    border-bottom: 1px solid rgba(255,255,255,.08);
    flex-shrink: 0;
}

.sidebar-brand .brand-mark {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--color-primary), #7c3aed);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 800;
    color: #fff;
    flex-shrink: 0;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-3) var(--space-2);
}

.sidebar-section-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: #64748b;
    padding: var(--space-3) var(--space-3) var(--space-1);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 9px var(--space-3);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: #cbd5e1;
    margin-bottom: 2px;
    cursor: pointer;
}
.nav-item:hover { background: rgba(255,255,255,.06); text-decoration: none; color: #fff; }
.nav-item.active { background: var(--color-primary); color: #fff; }
.nav-item .nav-icon { width: 18px; text-align: center; flex-shrink: 0; opacity: .9; }

.nav-item.nav-item-disabled {
    color: #64748b;
    cursor: default;
    justify-content: space-between;
}
.nav-item.nav-item-disabled:hover { background: none; color: #64748b; }
.nav-soon {
    font-size: 10px;
    background: rgba(255,255,255,.08);
    color: #94a3b8;
    padding: 2px 7px;
    border-radius: 999px;
    font-weight: 600;
    letter-spacing: .02em;
}

.sidebar-footer {
    padding: var(--space-3);
    border-top: 1px solid rgba(255,255,255,.08);
    font-size: 12px;
    color: #64748b;
    flex-shrink: 0;
}

.main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.topbar {
    height: var(--topbar-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0 var(--space-4);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    position: sticky;
    top: 0;
    z-index: 30;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    width: 36px;
    height: 36px;
    font-size: 16px;
    cursor: pointer;
    color: var(--color-text);
}

.topbar-title { font-weight: 700; font-size: 16px; color: var(--color-text); }

/* --- Kullanıcı menüsü (avatar + açılır menü) --- */
.user-menu { position: relative; }
.user-menu-trigger {
    display: flex;
    align-items: center;
    gap: 10px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    font-family: inherit;
}
.user-menu-trigger:hover { background: var(--color-bg); }

.avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), #7c3aed);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
}

.user-menu-info { text-align: left; display: none; }
.user-menu-name { font-size: 13px; font-weight: 600; color: var(--color-text); line-height: 1.2; }
.user-menu-role { font-size: 11px; color: var(--color-text-muted); line-height: 1.2; }
.user-menu-chevron { color: var(--color-text-faint); font-size: 10px; margin-left: 2px; }

.user-menu-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    padding: var(--space-2);
    z-index: 50;
}
.user-menu-dropdown[hidden] { display: none; }
.user-menu-dropdown .dropdown-header { padding: var(--space-2) var(--space-2) var(--space-3); border-bottom: 1px solid var(--color-border); margin-bottom: var(--space-2); }
.user-menu-dropdown .dropdown-header .name { font-weight: 600; font-size: 14px; }
.user-menu-dropdown .dropdown-header .email { font-size: 12px; color: var(--color-text-muted); }
.user-menu-dropdown a {
    display: block;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--color-text);
}
.user-menu-dropdown a:hover { background: var(--color-bg); text-decoration: none; }
.user-menu-dropdown a.danger { color: var(--color-danger); }

.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, .4);
    z-index: 35;
}

.container {
    /* Not: eskiden margin:0 auto ile 980px'e ortalanıyordu; bu, üstteki topbar'ın
       sola yaslı düzeniyle tutarsız kalıp içerik bloğunun sağda/solda büyük boş
       alanlarla "ortada yüzüyormuş" gibi görünmesine yol açıyordu (kullanıcı geri
       bildirimi). Artık topbar ile aynı hizada, sola yaslı ve geniş ekranlarda bile
       makul bir satır/kart genişliğinde kalması için üst sınırı yüksek tutuyoruz. */
    max-width: 1320px;
    width: 100%;
    margin: 0;
    padding: var(--space-4);
}

@media (max-width: 900px) {
    .sidebar { transform: translateX(-100%); box-shadow: var(--shadow-lg); }
    .app-shell.sidebar-open .sidebar { transform: translateX(0); }
    .app-shell.sidebar-open .sidebar-backdrop { display: block; }
    .main { margin-left: 0; }
    .sidebar-toggle { display: inline-flex; align-items: center; justify-content: center; }
}

@media (min-width: 560px) {
    .user-menu-info { display: block; }
}

/* =============================================================================
   Bileşenler (kart, buton, form, badge, vb.)
   ========================================================================== */

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
    box-shadow: var(--shadow-sm);
}

.card h2, .card h3 { margin-top: 0; }
.card-header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); margin-bottom: var(--space-3); flex-wrap: wrap; }
.card-header h2, .card-header h3 { margin: 0; }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    font-family: inherit;
}
.btn:hover { background: var(--color-primary-dark); text-decoration: none; }
.btn-secondary { background: var(--color-surface); color: var(--color-text); border: 1px solid var(--color-border-strong); }
.btn-secondary:hover { background: var(--color-bg); }
.btn-success { background: var(--color-success); }
.btn-danger { background: var(--color-danger); }
.btn-sm { padding: 6px 10px; font-size: 13px; }

.form-group { margin-bottom: var(--space-3); }
.form-group label { display: block; font-weight: 600; margin-bottom: var(--space-1); font-size: 13px; }
.form-control {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-family: inherit;
    background: #fff;
}
.form-control:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; }
.form-hint { color: var(--color-text-muted); font-size: 12px; margin-top: 4px; }
.form-error { color: var(--color-danger); font-size: 13px; margin-bottom: var(--space-2); }

/* Masaüstünde alanları yan yana yerleştiren form ızgarası — dar ekranda (<=640px)
   tek sütuna düşer. Mobil görünümle birebir aynı olmaması amaçlanmıştır. */
.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 var(--space-4);
    align-items: start;
}
.form-grid .form-group.full,
.form-grid .form-actions {
    grid-column: 1 / -1;
}
.form-grid .form-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-2);
    margin-top: var(--space-1);
}
@media (max-width: 640px) {
    .form-grid { grid-template-columns: 1fr; }
    .form-grid .form-actions { justify-content: stretch; }
    .form-grid .form-actions .btn { width: 100%; justify-content: center; }
}

/* Kart içinde ayrı bir alt bölüm olarak vurgulanan form panelleri (ör. "Yeni Görev Ata") */
.subpanel {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-4);
    margin-top: var(--space-4);
}
.subpanel-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 15px;
    margin-bottom: var(--space-3);
}
.subpanel-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    font-size: 14px;
    line-height: 1;
    flex-shrink: 0;
}

.badge {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}
.badge-gray { background: #f3f4f6; color: #374151; }
.badge-blue { background: #dbeafe; color: #1e40af; }
.badge-green { background: #dcfce7; color: #166534; }
.badge-red { background: #fee2e2; color: #991b1b; }
.badge-amber { background: #fef3c7; color: #92400e; }

.task-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border);
    flex-wrap: wrap;
}
.task-row:last-child { border-bottom: none; }
.task-title { font-weight: 600; }
.task-meta { color: var(--color-text-muted); font-size: 13px; margin-top: 2px; }

.empty-state {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--space-5) var(--space-3);
}

.tabs { display: flex; gap: var(--space-2); border-bottom: 1px solid var(--color-border); margin-bottom: var(--space-4); flex-wrap: wrap; }
.tab-link {
    padding: 10px 14px;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    color: var(--color-text-muted);
    font-size: 14px;
    font-weight: 600;
}
.tab-link.active { color: var(--color-primary); border-bottom: 2px solid var(--color-primary); }

.flash { padding: var(--space-3); border-radius: var(--radius); margin-bottom: var(--space-3); font-size: 14px; }
.flash-success { background: #dcfce7; color: #166534; }
.flash-error { background: #fee2e2; color: #991b1b; }
.flash-warning { background: #fef3c7; color: #92400e; }

.text-muted { color: var(--color-text-muted); }
.section-title { margin: var(--space-4) 0 var(--space-2); font-size: 15px; }
.section-title:first-child { margin-top: 0; }

.profile-header { display: flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-3); }
.avatar-lg { width: 56px; height: 56px; font-size: 20px; }

/* Bölüm 5 — sınırlı zengin metin (kalın/italik/6 sabit renk) */
.hl-red    { color: #b91c1c; }
.hl-orange { color: #c2410c; }
.hl-green  { color: #15803d; }
.hl-blue   { color: #1d4ed8; }
.hl-purple { color: #7e22ce; }
.hl-gray   { color: #4b5563; }

.mention-badge {
    background: #eef2ff;
    color: #3730a3;
    padding: 1px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.rt-toolbar { display: flex; gap: 4px; margin-bottom: 6px; }
.rt-toolbar button {
    border: 1px solid var(--color-border);
    background: #fff;
    border-radius: 6px;
    width: 30px; height: 30px;
    cursor: pointer;
    font-size: 13px;
}
.rt-toolbar .rt-swatch { width: 18px; height: 18px; border-radius: 50%; border: 1px solid rgba(0,0,0,.15); padding: 0; }

.editable-content {
    min-height: 70px;
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-sm);
    padding: 9px 12px;
    font-size: 14px;
    background: #fff;
}
.editable-content:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; }

.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3);
    background: var(--color-bg);
}
.login-card { width: 100%; max-width: 380px; }
.login-brand { display: flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-4); }

@media (max-width: 640px) {
    .container { padding: var(--space-3); }
    .task-row { flex-direction: column; align-items: flex-start; }
}