/* =====================================================================
   MyChatbot.gr — App stylesheet (v1)
   ===================================================================== */

/* ---------- Design tokens ---------- */
:root {
    --color-bg:           #f5f7fa;
    --color-bg-alt:       #ffffff;
    --color-surface:      #ffffff;
    --color-border:       #e3e8ee;
    --color-border-strong:#cdd6e0;

    --color-text:         #1a1f36;
    --color-text-muted:   #697386;
    --color-text-soft:    #8898aa;

    --color-primary:      #1F3A5F;
    --color-primary-hover:#142943;
    --color-primary-soft: #e8eef7;
    --color-accent:       #C9A14B;

    --color-success:      #16a34a;
    --color-success-bg:   #dcfce7;
    --color-error:        #dc2626;
    --color-error-bg:     #fee2e2;
    --color-warning:      #d97706;
    --color-warning-bg:   #fef3c7;

    --radius-sm: 6px;
    --radius:    8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --shadow-sm: 0 1px 2px rgba(20, 41, 67, 0.05);
    --shadow:    0 1px 3px rgba(20, 41, 67, 0.08), 0 1px 2px rgba(20, 41, 67, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(20, 41, 67, 0.10), 0 4px 6px -2px rgba(20, 41, 67, 0.05);

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

    --header-h: 60px;
    --sidebar-w: 240px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); text-decoration: underline; }
img, svg { max-width: 100%; display: block; }
button { font: inherit; cursor: pointer; }

/* ---------- Utility ---------- */
.muted        { color: var(--color-text-muted); font-size: 14px; }
.muted-inline { color: var(--color-text-muted); font-size: 0.9em; font-weight: normal; }

/* =====================================================================
   AUTH PAGES (login, register, forgot, reset)
   ===================================================================== */

body.auth-page {
    background: linear-gradient(180deg, #f5f7fa 0%, #eef2f7 100%);
    min-height: 100vh;
}

.auth-container {
    max-width: 480px;
    margin: 0 auto;
    padding: 48px 24px 32px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.auth-brand {
    text-align: center;
    margin-bottom: 32px;
}
.brand-link {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.02em;
    text-decoration: none;
}
.brand-link:hover { text-decoration: none; }
.brand-mark { color: var(--color-primary); }
.brand-tag  { color: var(--color-accent); }

.auth-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 36px 32px;
    flex: 1 0 auto;
}

.auth-header { margin-bottom: 24px; }
.auth-header h1 {
    font-size: 24px;
    margin: 0 0 8px;
    color: var(--color-text);
    font-weight: 700;
    letter-spacing: -0.01em;
}
.auth-header p { margin: 0; }

.auth-footer {
    text-align: center;
    margin-top: 32px;
    color: var(--color-text-soft);
    font-size: 13px;
}
.auth-footer p { margin: 4px 0; }
.auth-footer a { color: var(--color-text-muted); }

/* ---------- Forms ---------- */
.form { display: flex; flex-direction: column; gap: 16px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 480px) { .form-grid { grid-template-columns: 1fr; } }

.form-row { display: flex; flex-direction: column; gap: 6px; }
.form-row > label {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
}
.form-row > input,
.form-row > select,
.form-row > textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 15px;
    font-family: inherit;
    color: var(--color-text);
    background: #fff;
    transition: border-color .15s, box-shadow .15s;
}
.form-row > input:focus,
.form-row > select:focus,
.form-row > textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(31, 58, 95, 0.10);
}
.form-row > input[disabled] { background: #f8fafc; color: var(--color-text-soft); }

.form-helper-link {
    font-size: 13px;
    margin-top: 2px;
    align-self: flex-end;
}

.form-checkbox {
    flex-direction: row;
    align-items: flex-start;
    gap: 10px;
}
.form-checkbox > input[type="checkbox"] {
    margin-top: 2px;
    accent-color: var(--color-primary);
    width: 16px; height: 16px;
}
.form-checkbox > label {
    font-size: 13px;
    font-weight: normal;
    color: var(--color-text-muted);
}

.form-error,
.form-success,
.alert {
    padding: 10px 12px;
    border-radius: var(--radius);
    font-size: 14px;
}
.form-error, .alert-error {
    background: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid #fecaca;
}
.form-success, .alert-success {
    background: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid #bbf7d0;
}
.alert-warning {
    background: var(--color-warning-bg);
    color: var(--color-warning);
    border: 1px solid #fde68a;
}

.form-footer {
    text-align: center;
    margin: 16px 0 0;
    font-size: 14px;
    color: var(--color-text-muted);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    font-size: 14px;
    font-weight: 600;
    line-height: 1.2;
    cursor: pointer;
    transition: background-color .15s, border-color .15s, color .15s, transform .05s;
    white-space: nowrap;
    text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
.btn-block { width: 100%; padding: 12px 18px; font-size: 15px; }

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}
.btn-primary:hover { background: var(--color-primary-hover); color: #fff; text-decoration: none; }

.btn-secondary {
    background: var(--color-primary-soft);
    color: var(--color-primary);
    border-color: var(--color-primary-soft);
}
.btn-secondary:hover { background: #d6e1f0; color: var(--color-primary); text-decoration: none; }

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
    border-color: var(--color-border);
}
.btn-ghost:hover { background: var(--color-bg); color: var(--color-text); text-decoration: none; }

.btn[disabled],
.btn.is-loading {
    opacity: 0.7;
    cursor: not-allowed;
    pointer-events: none;
}
.btn-spinner {
    width: 16px; height: 16px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: btn-spin .6s linear infinite;
}
@keyframes btn-spin { to { transform: rotate(360deg); } }

/* =====================================================================
   APP SHELL (dashboard)
   ===================================================================== */

body.app-shell {
    background: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.app-topbar {
    height: var(--header-h);
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 16px;
    position: sticky;
    top: 0;
    z-index: 10;
}
.topbar-brand { font-size: 16px; color: var(--color-primary); }
.topbar-brand strong { font-weight: 700; }
.topbar-spacer { flex: 1; }
.topbar-user {
    display: flex; align-items: center; gap: 12px;
    color: var(--color-text-muted); font-size: 14px;
}

.app-layout {
    display: flex;
    flex: 1 1 auto;
    min-height: 0;
}

.app-sidebar {
    width: var(--sidebar-w);
    background: var(--color-bg-alt);
    border-right: 1px solid var(--color-border);
    padding: 16px 12px;
    flex-shrink: 0;
}
.app-sidebar nav { display: flex; flex-direction: column; gap: 2px; }
.nav-link {
    padding: 9px 12px;
    border-radius: var(--radius);
    color: var(--color-text-muted);
    font-size: 14px;
    font-weight: 500;
    transition: background-color .12s, color .12s;
}
.nav-link:hover { background: var(--color-primary-soft); color: var(--color-primary); text-decoration: none; }
.nav-link.is-active { background: var(--color-primary-soft); color: var(--color-primary); font-weight: 600; }

.app-main {
    flex: 1 1 auto;
    padding: 24px 32px 48px;
    overflow-y: auto;
    max-width: 100%;
}

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}
.page-header h1 {
    font-size: 22px;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.01em;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.stat-card .stat-label {
    font-size: 13px; color: var(--color-text-muted);
    text-transform: uppercase; letter-spacing: 0.04em;
    font-weight: 600;
}
.stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
    margin: 6px 0 4px;
    color: var(--color-text);
    letter-spacing: -0.02em;
}
.stat-card .stat-help {
    font-size: 12px; color: var(--color-text-soft);
}

.welcome-card { padding: 28px; }
.welcome-card h2 { font-size: 20px; margin: 0 0 12px; font-weight: 700; }
.welcome-card p { margin: 0 0 16px; color: var(--color-text-muted); line-height: 1.6; }
.welcome-card p:last-child { margin-bottom: 0; }

/* ---------- Mobile responsive ---------- */
@media (max-width: 768px) {
    .app-layout { flex-direction: column; }
    .app-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        padding: 8px;
    }
    .app-sidebar nav {
        flex-direction: row;
        overflow-x: auto;
        gap: 4px;
    }
    .nav-link { white-space: nowrap; }
    .app-main { padding: 16px; }
}

/* ---------- Admin tint ---------- */
body.admin-shell .topbar-brand { color: #b91c1c; }
body.admin-shell .topbar-brand::before { content: ""; }
/* ===== Footer πλατφόρμας ===== */
.platform-footer {
    text-align: center;
    padding: 18px 24px;
    font-size: 12px;
    line-height: 1.7;
    color: #6b7a8d;
    background: #f5f7fa;
    border-top: 1px solid rgba(15, 26, 46, 0.08);
}
.platform-footer .pf-line { margin: 1px 0; }
.platform-footer a {
    color: #1F3A5F;
    text-decoration: none;
    font-weight: 500;
}
.platform-footer a:hover { text-decoration: underline; }
.platform-footer .pf-sep { margin: 0 7px; opacity: 0.45; }