/* ============================================================
   TcpMail — Claude-inspired Design System
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
    /* Background */
    --bg-page: #FAF8F5;
    --bg-card: #FFFFFF;
    --bg-hover: #F5F2EE;
    --bg-secondary: #F3F0EC;
    --bg-tertiary: #EDE9E3;
    --bg-input: #FFFFFF;

    /* Foreground */
    --text-primary: #141413;
    --text-secondary: #5E5D59;
    --text-tertiary: #8A8883;
    --text-placeholder: #B0ADA8;

    /* Borders */
    --border-primary: #E0DDD6;
    --border-secondary: #EBE7E0;
    --border-focus: #141413;

    /* Accent */
    --accent: #D97706;
    --accent-hover: #B86504;
    --accent-light: #FEF3C7;
    --accent-subtle: #FFFBEB;

    /* Semantic */
    --success: #059669;
    --success-bg: #ECFDF5;
    --success-border: #A7F3D0;
    --danger: #DC2626;
    --danger-bg: #FEF2F2;
    --danger-border: #FECACA;
    --warning: #D97706;
    --warning-bg: #FFFBEB;

    /* Button variants */
    --btn-primary-bg: #141413;
    --btn-primary-text: #FFFFFF;
    --btn-primary-hover-bg: #2D2D2B;
    --btn-secondary-bg: #FFFFFF;
    --btn-secondary-text: #141413;
    --btn-secondary-border: #D4D0C9;
    --btn-secondary-hover-bg: #F5F2EE;
    --btn-ghost-text: #5E5D59;
    --btn-ghost-hover-bg: #F3F0EC;

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.03);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.03);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.03);
    --shadow-lg: 0 10px 32px rgba(0,0,0,0.06), 0 4px 8px rgba(0,0,0,0.03);
    --shadow-xl: 0 20px 48px rgba(0,0,0,0.08);

    /* Radius */
    --radius-xs: 6px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Typography */
    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", "Source Code Pro", monospace;

    /* Sizing */
    --max-width: 1120px;
    --nav-height: 60px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --duration-fast: 120ms;
    --duration-normal: 200ms;
    --duration-slow: 300ms;
}

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    background-color: var(--bg-page);
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    font-size: 15px;
}

::selection {
    background-color: var(--accent-light);
    color: var(--text-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out);
}

/* ---------- Navbar ---------- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(250, 248, 245, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-secondary);
    height: var(--nav-height);
    display: flex;
    align-items: center;
}
.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-brand {
    font-size: 18px;
    font-weight: 650;
    color: var(--text-primary);
    letter-spacing: -0.3px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-brand-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 2px;
}
.nav-links a {
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 480;
    transition: all var(--duration-fast) var(--ease-out);
}
.nav-links a:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}
.nav-user {
    padding: 7px 14px;
    color: var(--text-tertiary);
    font-size: 13px;
    font-family: var(--font-mono);
    font-weight: 450;
}
.nav-logout {
    padding: 7px 14px !important;
    border-radius: var(--radius-sm);
    color: var(--danger) !important;
    font-size: 14px !important;
    font-weight: 480;
    transition: all var(--duration-fast) var(--ease-out);
}
.nav-logout:hover {
    background-color: var(--danger-bg) !important;
}

/* ---------- Layout ---------- */
.main-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 36px 24px 64px;
}

/* ---------- Flash Messages ---------- */
.flash-messages {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.flash {
    padding: 11px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 480;
    line-height: 1.5;
    transition: opacity var(--duration-normal) var(--ease-out),
                transform var(--duration-normal) var(--ease-out);
}
.flash-success {
    background-color: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
}
.flash-error {
    background-color: var(--danger-bg);
    color: var(--danger);
    border: 1px solid var(--danger-border);
}
.flash-warning {
    background-color: var(--warning-bg);
    color: var(--warning);
    border: 1px solid #FDE68A;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 9px 18px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 520;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--duration-fast) var(--ease-out);
    font-family: var(--font-sans);
    text-decoration: none;
    white-space: nowrap;
    letter-spacing: -0.1px;
}
.btn:active {
    transform: scale(0.98);
}
.btn-primary {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
}
.btn-primary:hover {
    background-color: var(--btn-primary-hover-bg);
    color: var(--btn-primary-text);
}
.btn-secondary {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border-color: var(--btn-secondary-border);
}
.btn-secondary:hover {
    background-color: var(--btn-secondary-hover-bg);
}
.btn-danger {
    background-color: var(--danger);
    color: #FFFFFF;
}
.btn-danger:hover {
    background-color: #B91C1C;
}
.btn-ghost {
    background: transparent;
    color: var(--btn-ghost-text);
    border: none;
}
.btn-ghost:hover {
    background-color: var(--btn-ghost-hover-bg);
    color: var(--text-primary);
}
.btn-full {
    width: 100%;
    justify-content: center;
    padding: 12px 20px;
    font-size: 15px;
}
.btn-sm {
    padding: 5px 12px;
    font-size: 12px;
    border-radius: var(--radius-xs);
}
.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
}

/* ---------- Auth Pages ---------- */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 120px);
    padding: 24px;
}
.auth-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-secondary);
    padding: 48px 44px;
    width: 100%;
    max-width: 440px;
}
.auth-header {
    text-align: center;
    margin-bottom: 36px;
}
.auth-header .brand-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--accent-light);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 20px;
}
.auth-header h1 {
    font-size: 26px;
    font-weight: 650;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: -0.4px;
}
.auth-header p {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 420;
}
.auth-form .form-group {
    margin-bottom: 20px;
}
.auth-form label {
    display: block;
    font-size: 13px;
    font-weight: 550;
    color: var(--text-primary);
    margin-bottom: 7px;
    letter-spacing: -0.1px;
}
.auth-form input,
.auth-form select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    font-size: 15px;
    background: var(--bg-input);
    color: var(--text-primary);
    transition: border-color var(--duration-fast) var(--ease-out),
                box-shadow var(--duration-fast) var(--ease-out);
    font-family: var(--font-sans);
}
.auth-form input::placeholder {
    color: var(--text-placeholder);
}
.auth-form input:focus,
.auth-form select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(20,20,19,0.08);
}
.auth-footer {
    text-align: center;
    margin-top: 28px;
    padding-top: 24px;
    border-top: 1px solid var(--border-secondary);
}
.auth-footer p {
    font-size: 14px;
    color: var(--text-secondary);
}
.auth-footer a {
    color: var(--accent);
    font-weight: 520;
}
.auth-footer a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.email-input-group {
    display: flex;
    align-items: center;
}
.email-input-group input {
    flex: 1;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    border-right: none;
}
.email-at {
    padding: 10px 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-left: none;
    border-right: none;
    color: var(--text-tertiary);
    font-size: 15px;
    font-weight: 480;
    user-select: none;
}
.domain-select {
    border-top-left-radius: 0 !important;
    border-bottom-left-radius: 0 !important;
    width: auto !important;
    min-width: 145px;
    cursor: pointer;
    padding: 10px 36px 10px 14px;
    appearance: none;
    -webkit-appearance: none;
    background-color: var(--bg-input);
    background-image: url("data:image/svg+xml,%3Csvg width='12' height='7' viewBox='0 0 12 7' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%238A8883' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    font-size: 15px;
    font-weight: 480;
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    transition: border-color var(--duration-fast) var(--ease-out),
                box-shadow var(--duration-fast) var(--ease-out),
                background-color var(--duration-fast) var(--ease-out);
    font-family: var(--font-sans);
}
.domain-select:hover {
    background-color: var(--bg-hover);
    border-color: var(--border-focus);
}
.domain-select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(20,20,19,0.08);
}
.domain-select option {
    padding: 10px 14px;
    font-size: 14px;
    background: var(--bg-card);
    color: var(--text-primary);
}

/* ---------- Dashboard ---------- */
.dashboard {
    max-width: 720px;
    margin: 0 auto;
}
.welcome-section {
    margin-bottom: 36px;
}
.welcome-section h1 {
    font-size: 30px;
    font-weight: 650;
    letter-spacing: -0.5px;
    margin-bottom: 4px;
}
.user-email {
    color: var(--text-secondary);
    font-size: 15px;
    font-family: var(--font-mono);
    font-weight: 450;
}
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 14px;
    margin-bottom: 32px;
}
.dash-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-secondary);
    padding: 26px 24px;
    display: block;
    color: var(--text-primary);
    transition: box-shadow var(--duration-fast) var(--ease-out),
                border-color var(--duration-fast) var(--ease-out),
                transform var(--duration-fast) var(--ease-out);
    text-align: left;
}
.dash-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--border-primary);
    transform: translateY(-1px);
    color: var(--text-primary);
}
.dash-card-icon {
    color: var(--accent);
    margin-bottom: 14px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-subtle);
    border-radius: var(--radius-sm);
}
.dash-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
    letter-spacing: -0.2px;
}
.dash-card p {
    font-size: 13px;
    color: var(--text-tertiary);
    font-weight: 420;
    line-height: 1.5;
}

.forward-status {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-secondary);
    font-size: 14px;
    font-weight: 460;
}

.status-indicator {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    flex-shrink: 0;
}
.status-indicator.active {
    background-color: var(--success);
    box-shadow: 0 0 0 4px rgba(5,150,105,0.12);
}
.status-indicator.inactive {
    background-color: var(--text-tertiary);
}

.quota-bar-wrap {
    padding: 14px 20px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-secondary);
}
.quota-section {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 4px;
}
.quota-bar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}
.quota-bar-label {
    font-size: 13px;
    font-weight: 520;
    color: var(--text-secondary);
}
.quota-bar-value {
    font-size: 13px;
    font-weight: 550;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}
.quota-bar-track {
    height: 6px;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
}
.quota-bar-fill {
    height: 100%;
    background: var(--accent);
    border-radius: var(--radius-full);
    transition: width var(--duration-slow) var(--ease-out);
}
.quota-bar-fill.warning {
    background: var(--danger);
}

/* ---------- Inbox ---------- */
.inbox-page h1 {
    font-size: 24px;
    font-weight: 650;
    letter-spacing: -0.3px;
    margin-bottom: 20px;
}
.inbox-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}
.search-form {
    display: flex;
    gap: 8px;
}
.search-input {
    padding: 8px 14px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    font-size: 14px;
    background: var(--bg-input);
    min-width: 220px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    transition: border-color var(--duration-fast) var(--ease-out);
}
.search-input::placeholder {
    color: var(--text-placeholder);
}
.search-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(20,20,19,0.08);
}

.mail-list {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-secondary);
    overflow: hidden;
}
.mail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 22px;
    transition: background-color var(--duration-fast) var(--ease-out);
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-secondary);
}
.mail-item:last-child {
    border-bottom: none;
}
.mail-item:hover {
    background-color: var(--bg-hover);
}
.mail-item-main {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}
.mail-from {
    display: flex;
    gap: 8px;
    align-items: baseline;
    margin-bottom: 3px;
}
.mail-from-name {
    font-weight: 550;
    font-size: 14px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.mail-from-addr {
    font-size: 12px;
    color: var(--text-tertiary);
    font-family: var(--font-mono);
    white-space: nowrap;
}
.mail-subject {
    font-size: 14px;
    font-weight: 480;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.mail-preview {
    font-size: 13px;
    color: var(--text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 400;
}
.mail-item-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 5px;
    margin-left: 20px;
    flex-shrink: 0;
}
.mail-time {
    font-size: 12px;
    color: var(--text-tertiary);
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}
.mail-attachment-icon {
    font-size: 14px;
    opacity: 0.5;
}

.empty-state {
    text-align: center;
    padding: 80px 20px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-secondary);
}
.empty-icon {
    color: var(--text-tertiary);
    margin-bottom: 16px;
    opacity: 0.4;
}
.empty-state h3 {
    font-size: 17px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 550;
}
.empty-state p {
    color: var(--text-tertiary);
    font-size: 14px;
    font-weight: 420;
}

/* ---------- Mail Detail ---------- */
.mail-detail {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-secondary);
    padding: 36px;
}
.mail-detail-header {
    margin-bottom: 24px;
}
.mail-detail-header h1 {
    font-size: 22px;
    font-weight: 650;
    margin-top: 14px;
    letter-spacing: -0.3px;
    line-height: 1.35;
}
.mail-detail-meta {
    padding: 18px 0;
    border-top: 1px solid var(--border-secondary);
    border-bottom: 1px solid var(--border-secondary);
    margin-bottom: 28px;
}
.meta-row {
    display: flex;
    gap: 10px;
    margin-bottom: 7px;
    font-size: 14px;
}
.meta-row:last-child {
    margin-bottom: 0;
}
.meta-label {
    color: var(--text-tertiary);
    flex-shrink: 0;
    min-width: 56px;
    font-weight: 450;
}
.meta-value {
    color: var(--text-primary);
    font-weight: 460;
    word-break: break-all;
}
.mail-detail-body {
    line-height: 1.75;
    margin-bottom: 28px;
    font-size: 15px;
}
.mail-text {
    font-family: var(--font-sans);
    white-space: pre-wrap;
    font-size: 15px;
    line-height: 1.75;
}
.mail-html {
    font-size: 15px;
    line-height: 1.75;
}

.mail-attachments {
    padding-top: 24px;
    border-top: 1px solid var(--border-secondary);
}
.mail-attachments h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 14px;
    color: var(--text-secondary);
}
.attachment-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.attachment-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 13px;
    border: 1px solid var(--border-secondary);
    transition: border-color var(--duration-fast) var(--ease-out);
}
.attachment-item:hover {
    border-color: var(--border-primary);
}
.attachment-name {
    font-weight: 500;
}
.attachment-size {
    color: var(--text-tertiary);
    font-size: 12px;
    font-variant-numeric: tabular-nums;
}
.attachment-unavailable {
    color: var(--text-tertiary);
    font-size: 12px;
    font-style: italic;
}

/* ---------- Compose ---------- */
.compose-page {
    max-width: 760px;
    margin: 0 auto;
}
.compose-header h1 {
    font-size: 24px;
    font-weight: 650;
    letter-spacing: -0.3px;
    margin-bottom: 24px;
}
.compose-form {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-secondary);
    padding: 30px;
}
.form-row {
    margin-bottom: 18px;
}
.form-row label {
    display: block;
    font-size: 13px;
    font-weight: 550;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: -0.1px;
}
.form-row input,
.form-row textarea,
.form-row select {
    width: 100%;
    padding: 9px 14px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    font-size: 14px;
    background: var(--bg-input);
    color: var(--text-primary);
    font-family: var(--font-sans);
    transition: border-color var(--duration-fast) var(--ease-out),
                box-shadow var(--duration-fast) var(--ease-out);
}
.form-row input::placeholder,
.form-row textarea::placeholder {
    color: var(--text-placeholder);
}
.form-row input:focus,
.form-row textarea:focus,
.form-row select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(20,20,19,0.08);
}
.form-row textarea {
    resize: vertical;
    min-height: 220px;
    font-size: 14px;
    line-height: 1.7;
}
.form-disabled {
    background-color: var(--bg-secondary) !important;
    color: var(--text-tertiary) !important;
    cursor: not-allowed;
}
.required {
    color: var(--danger);
    font-weight: 550;
}
.form-hint {
    display: block;
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 5px;
    font-weight: 420;
}
.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 26px;
}
.body-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 0;
}
.tab-btn {
    padding: 7px 18px;
    border: 1px solid var(--border-primary);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    font-family: var(--font-sans);
    font-weight: 480;
    border-radius: 0;
    transition: all var(--duration-fast) var(--ease-out);
}
.tab-btn:first-child {
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}
.tab-btn:last-child {
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.tab-btn.active {
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border-color: var(--btn-primary-bg);
}

/* ---------- Settings ---------- */
.settings-page {
    max-width: 720px;
    margin: 0 auto;
}
.settings-page h1 {
    font-size: 24px;
    font-weight: 650;
    letter-spacing: -0.3px;
    margin-bottom: 32px;
}
.settings-section {
    margin-bottom: 36px;
}
.settings-section h2 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
    letter-spacing: -0.2px;
}
.section-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 18px;
    line-height: 1.65;
    font-weight: 420;
}
.info-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-secondary);
    padding: 4px 0;
}
.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 22px;
    font-size: 14px;
}
.info-row + .info-row {
    border-top: 1px solid var(--border-secondary);
}
.info-label {
    color: var(--text-secondary);
    font-weight: 460;
}
.info-value {
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 13px;
    font-weight: 450;
}

.forward-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-secondary);
    padding: 24px 26px;
}
.forward-card.active {
    border-color: var(--success-border);
}
.forward-status-bar {
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 15px;
    font-weight: 580;
    margin-bottom: 18px;
    color: var(--text-primary);
}
.status-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    flex-shrink: 0;
}
.status-dot.active {
    background-color: var(--success);
    box-shadow: 0 0 0 4px rgba(5,150,105,0.12);
}
.status-dot.inactive {
    background-color: var(--text-tertiary);
}
.forward-info {
    margin-bottom: 18px;
}
.forward-info .info-row {
    padding: 6px 0;
}
.forward-target {
    color: var(--accent) !important;
    font-weight: 550 !important;
}
.forward-form {
    margin-top: 18px;
}
.form-inline {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.form-inline label {
    font-size: 13px;
    font-weight: 550;
    color: var(--text-secondary);
    white-space: nowrap;
}
.form-inline input {
    flex: 1;
    min-width: 200px;
    padding: 9px 14px;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    font-size: 14px;
    background: var(--bg-input);
    color: var(--text-primary);
    font-family: var(--font-sans);
    transition: border-color var(--duration-fast) var(--ease-out);
}
.form-inline input::placeholder {
    color: var(--text-placeholder);
}
.form-inline input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(20,20,19,0.08);
}

.settings-section:last-child {
    padding-top: 24px;
    border-top: 1px solid var(--border-secondary);
}
.settings-section:last-child p {
    font-size: 13px;
    color: var(--text-tertiary);
    font-weight: 420;
    line-height: 1.7;
}

/* ---------- Modal ---------- */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    animation: fadeIn 0.15s var(--ease-out);
}
.modal-overlay.closing {
    animation: fadeOut 0.12s var(--ease-out) forwards;
}
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

.modal-dialog {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-secondary);
    width: 100%;
    max-width: 480px;
    max-height: 85vh;
    overflow-y: auto;
    animation: modalSlideIn 0.2s var(--ease-out);
}
.modal-dialog.closing {
    animation: modalSlideOut 0.15s var(--ease-out) forwards;
}
@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(8px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}
@keyframes modalSlideOut {
    from {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    to {
        opacity: 0;
        transform: translateY(8px) scale(0.97);
    }
}

.modal-header {
    padding: 24px 28px 0;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
}
.modal-header h2 {
    font-size: 18px;
    font-weight: 650;
    letter-spacing: -0.2px;
    color: var(--text-primary);
}
.modal-close {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    cursor: pointer;
    color: var(--text-tertiary);
    font-size: 20px;
    line-height: 1;
    transition: all var(--duration-fast) var(--ease-out);
    flex-shrink: 0;
}
.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: 16px 28px;
    font-size: 14px;
    line-height: 1.65;
    color: var(--text-secondary);
}
.modal-body p {
    margin-bottom: 12px;
}
.modal-body p:last-child {
    margin-bottom: 0;
}
.modal-body strong {
    color: var(--text-primary);
    font-weight: 600;
}

.modal-footer {
    padding: 0 28px 24px;
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* ── Toggle Switch ─────────────────────────────────────────────── */

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}
.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--border-primary);
    border-radius: 24px;
    cursor: pointer;
    transition: background var(--duration-fast) var(--ease-out);
}
.toggle-slider::before {
    content: "";
    position: absolute;
    width: 18px;
    height: 18px;
    left: 3px;
    bottom: 3px;
    background: #fff;
    border-radius: 50%;
    transition: transform var(--duration-fast) var(--ease-out);
    box-shadow: 0 1px 3px rgba(0,0,0,0.12);
}
.toggle-switch input:checked + .toggle-slider {
    background: var(--success);
}
.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(20px);
}


/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 768px) {
    .nav-links {
        gap: 0;
    }
    .nav-links a {
        padding: 6px 9px;
        font-size: 13px;
    }
    .nav-user {
        display: none;
    }
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    .search-form {
        flex-direction: column;
        width: 100%;
    }
    .search-input {
        min-width: 0;
        width: 100%;
    }
    .mail-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .mail-item-meta {
        flex-direction: row;
        gap: 14px;
    }
    .form-inline {
        flex-direction: column;
        align-items: stretch;
    }
    .mail-detail {
        padding: 22px;
    }
    .auth-card {
        padding: 36px 28px;
    }
    .compose-form {
        padding: 20px;
    }
}