/* ==========================================================================
   Talk App — design tokens & base styles shared by every page
   ========================================================================== */

:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-accent: #ec4899;

    --gradient-brand: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);

    --color-bg: #f4f5fb;
    --color-surface: #ffffff;
    --color-surface-muted: #f8f9fd;
    --color-border: #e6e7f0;

    --color-text: #1c1d2b;
    --color-text-muted: #6b7086;
    --color-text-faint: #9799ab;

    --color-danger: #ef4444;
    --color-danger-bg: #fef2f2;
    --color-success: #16a34a;
    --color-success-bg: #f0fdf4;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-pill: 999px;

    --shadow-sm: 0 1px 2px rgba(28, 29, 43, 0.06);
    --shadow-md: 0 8px 24px rgba(28, 29, 43, 0.08);
    --shadow-lg: 0 24px 60px rgba(28, 29, 43, 0.16);

    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-weight: 700;
    letter-spacing: -0.01em;
}

p {
    margin: 0;
}

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

a:hover {
    text-decoration: underline;
}

.hidden {
    display: none !important;
}

/* Thin, modern scrollbars */
* {
    scrollbar-width: thin;
    scrollbar-color: #d3d5e4 transparent;
}

*::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

*::-webkit-scrollbar-thumb {
    background-color: #d3d5e4;
    border-radius: var(--radius-pill);
}

/* ---------- Buttons ---------- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: none;
    border-radius: var(--radius-md);
    padding: 0.85rem 1.25rem;
    font-family: inherit;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.12s ease, box-shadow 0.12s ease, opacity 0.12s ease, background-color 0.12s ease;
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    transform: none;
}

.btn-primary {
    background: var(--gradient-brand);
    color: #fff;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    box-shadow: 0 10px 24px rgba(99, 102, 241, 0.35);
}

.btn-block {
    width: 100%;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: background-color 0.12s ease, color 0.12s ease;
}

.icon-btn:hover {
    background-color: var(--color-surface-muted);
    color: var(--color-text);
}

/* ---------- Forms ---------- */

.form-group {
    margin-bottom: 1.1rem;
}

.form-label {
    display: block;
    margin-bottom: 0.4rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.form-control {
    width: 100%;
    padding: 0.8rem 1rem;
    font-family: inherit;
    font-size: 0.95rem;
    color: var(--color-text);
    background-color: var(--color-surface-muted);
    border: 1.5px solid transparent;
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color 0.12s ease, background-color 0.12s ease;
}

.form-control::placeholder {
    color: var(--color-text-faint);
}

.form-control:focus {
    border-color: var(--color-primary);
    background-color: var(--color-surface);
}

.form-control.is-invalid {
    border-color: var(--color-danger);
}

.field-error {
    margin-top: 0.35rem;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-danger);
}

.input-wrap {
    position: relative;
}

.input-wrap .form-control {
    padding-right: 2.75rem;
}

.input-wrap .input-action {
    position: absolute;
    top: 50%;
    right: 0.35rem;
    transform: translateY(-50%);
}

/* ---------- Alerts ---------- */

.alert {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.87rem;
    font-weight: 500;
    margin-bottom: 1.1rem;
}

.alert-danger {
    background-color: var(--color-danger-bg);
    color: var(--color-danger);
}

.alert-success {
    background-color: var(--color-success-bg);
    color: var(--color-success);
}

/* ---------- Avatars ---------- */

.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    font-size: 0.9rem;
    border-radius: 50%;
    font-weight: 700;
    text-transform: uppercase;
    color: #fff;
    background: var(--gradient-brand);
    overflow: hidden;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ---------- Spinner ---------- */

.spinner {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: 2.5px solid rgba(255, 255, 255, 0.4);
    border-top-color: #fff;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}