/* =========================================================
 * IMAPy Webmail - Modern UI
 * Design tokens, Layout, Components
 * ========================================================= */

:root {
    --bg: #f6f7fb;
    --bg-elevated: #ffffff;
    --surface: #ffffff;
    --surface-muted: #f1f3f8;
    --border: #e5e8ef;
    --border-strong: #d4d9e3;
    --text: #1f2430;
    --text-muted: #6b7280;
    --text-subtle: #9aa0ad;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-soft: #eef2ff;
    --accent: #0ea5e9;
    --danger: #ef4444;
    --danger-soft: #fef2f2;
    --success: #10b981;
    --warning: #f59e0b;

    --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
    --shadow-md: 0 6px 18px rgba(15, 23, 42, .08);
    --shadow-lg: 0 18px 40px rgba(15, 23, 42, .12);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

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

    --nav-width: 260px;
    --list-width: 420px;
    --header-height: 56px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

button { font-family: inherit; }

/* =========================================================
 * LOGIN
 * ========================================================= */
.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 1.5rem;
    background:
        radial-gradient(1200px 600px at 10% -10%, rgba(79, 70, 229, .15), transparent 60%),
        radial-gradient(900px 500px at 110% 110%, rgba(14, 165, 233, .18), transparent 60%),
        var(--bg);
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 2.25rem 2rem 2rem;
}

.login-brand {
    display: flex;
    align-items: center;
    gap: .65rem;
    margin-bottom: 1.5rem;
}

.login-brand-mark {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: grid;
    place-items: center;
    color: #fff;
    font-weight: 700;
    font-size: 16px;
    letter-spacing: .5px;
    box-shadow: var(--shadow-sm);
}

.login-brand-name {
    font-weight: 600;
    font-size: 16px;
    color: var(--text);
}

.login-title {
    font-size: 22px;
    font-weight: 600;
    margin: 0 0 .35rem;
}

.login-subtitle {
    margin: 0 0 1.5rem;
    color: var(--text-muted);
    font-size: 14px;
}

.login-error {
    background: var(--danger-soft);
    color: var(--danger);
    border: 1px solid #fecaca;
    border-radius: var(--radius-sm);
    padding: .6rem .8rem;
    margin-bottom: 1rem;
    font-size: 13px;
}

.field {
    display: block;
    margin-bottom: 1rem;
}

.field-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .04em;
    margin-bottom: .35rem;
}

.field-input {
    width: 100%;
    padding: .7rem .85rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    background: var(--surface);
    color: var(--text);
    font-size: 14px;
    transition: border-color .15s ease, box-shadow .15s ease;
}

.field-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, .15);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .4rem;
    padding: .65rem 1.1rem;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color .15s ease, color .15s ease,
                border-color .15s ease, box-shadow .15s ease, transform .05s ease;
}

.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(79, 70, 229, .25); }

.btn-primary {
    background: var(--primary);
    color: #fff;
}
.btn-primary:hover { background: var(--primary-hover); color: #fff; }

.btn-block { width: 100%; }

.btn-ghost {
    background: transparent;
    color: var(--text);
    border-color: var(--border-strong);
}
.btn-ghost:hover { background: var(--surface-muted); }

.btn-danger {
    background: var(--surface);
    color: var(--danger);
    border-color: #fecaca;
}
.btn-danger:hover { background: var(--danger-soft); }

/* =========================================================
 * MAILBOX LAYOUT
 * ========================================================= */
.app-shell {
    height: 100vh;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: var(--header-height) 1fr;
    grid-template-areas:
        "header"
        "content";
}

.app-header {
    grid-area: header;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    z-index: 5;
}

.app-header-left,
.app-header-right {
    display: flex;
    align-items: center;
    gap: .75rem;
}

.app-brand {
    display: flex;
    align-items: center;
    gap: .6rem;
    font-weight: 600;
    color: var(--text);
}

.app-brand-mark {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: grid;
    place-items: center;
    color: #fff;
    font-weight: 700;
    font-size: 13px;
    letter-spacing: .5px;
}

.user-chip {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    padding: .35rem .7rem .35rem .35rem;
    background: var(--surface-muted);
    border-radius: 999px;
    font-size: 13px;
    color: var(--text-muted);
}

.logout-form { margin: 0; display: inline-flex; }
.logout-form .btn { padding: .35rem .75rem; font-size: 13px; }

.user-avatar {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366f1, #0ea5e9);
    color: #fff;
    display: grid;
    place-items: center;
    font-size: 11px;
    font-weight: 600;
}

.icon-button {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-muted);
    display: grid;
    place-items: center;
    cursor: pointer;
    transition: background-color .15s ease, color .15s ease;
}

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

.nav-toggle {
    display: inline-flex;
}

.app-content {
    grid-area: content;
    display: grid;
    grid-template-columns: 1fr;
    min-height: 0;
    position: relative;
}

.app-nav {
    background: var(--surface);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    display: none;
    flex-direction: column;
}

.app-nav.is-open { display: flex; }

.nav-section {
    padding: 1rem .85rem .5rem;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--text-subtle);
    margin: 0 0 .5rem;
    padding: 0 .35rem;
}

.nav-list { list-style: none; padding: 0; margin: 0; }

.nav-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .5rem;
    padding: .55rem .7rem;
    border-radius: var(--radius-md);
    color: var(--text);
    cursor: pointer;
    font-size: 14px;
    transition: background-color .15s ease, color .15s ease;
    border: 1px solid transparent;
}

.nav-item:hover { background: var(--surface-muted); }
.nav-item.is-active {
    background: var(--primary-soft);
    color: var(--primary);
    border-color: rgba(79, 70, 229, .25);
    font-weight: 500;
}

.nav-item-left {
    display: flex;
    align-items: center;
    gap: .55rem;
    min-width: 0;
}

.nav-item-icon {
    width: 16px;
    height: 16px;
    color: var(--text-subtle);
    flex-shrink: 0;
}
.nav-item.is-active .nav-item-icon { color: var(--primary); }

.nav-item-label {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.nav-count {
    font-size: 11px;
    background: var(--surface-muted);
    color: var(--text-muted);
    padding: 2px 7px;
    border-radius: 999px;
    font-weight: 500;
    flex-shrink: 0;
}

.nav-item.is-active .nav-count {
    background: rgba(79, 70, 229, .12);
    color: var(--primary);
}

.nav-item.is-unread .nav-count {
    background: var(--primary);
    color: #fff;
}

/* ---- list / main ---- */
.app-list {
    background: var(--surface);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.app-list-header {
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: .9rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .5rem;
}

.app-list-title {
    margin: 0;
    font-size: 15px;
    font-weight: 600;
}

.app-list-tools { display: flex; gap: .35rem; }

.app-main {
    background: var(--bg);
    overflow-y: auto;
    min-height: 0;
}

.empty-state {
    display: grid;
    place-items: center;
    height: 100%;
    text-align: center;
    color: var(--text-muted);
    padding: 2rem;
}

.empty-state-title {
    font-weight: 600;
    color: var(--text);
    margin: .75rem 0 .35rem;
}

/* =========================================================
 * EMAIL LIST ITEMS
 * ========================================================= */
.email-item {
    display: flex;
    align-items: flex-start;
    gap: .85rem;
    padding: .9rem 1rem;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background-color .12s ease;
    border-left: 3px solid transparent;
    background: var(--surface);
}

.email-item:hover { background: var(--surface-muted); }
.email-item.is-selected {
    background: var(--primary-soft);
    border-left-color: var(--primary);
}
.email-item.is-unread {
    border-left-color: var(--primary);
    background: #fafbff;
}
.email-item.is-unread .email-subject,
.email-item.is-unread .email-name { font-weight: 600; color: var(--text); }

.email-item.is-active {
    background: var(--primary-soft);
    border-left-color: var(--primary);
    color: var(--primary);
}
.email-item.is-active .email-subject,
.email-item.is-active .email-name { color: var(--primary); }

.email-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, #818cf8, #22d3ee);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 600;
    font-size: 13px;
    flex-shrink: 0;
    text-transform: uppercase;
}

.email-body {
    flex: 1;
    min-width: 0;
}

.email-row {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: .5rem;
}

.email-name {
    margin: 0;
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0;
}

.email-time {
    font-size: 12px;
    color: var(--text-subtle);
    flex-shrink: 0;
}

.email-subject {
    margin: .15rem 0;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.email-preview {
    margin: 0;
    font-size: 13px;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* =========================================================
 * EMAIL CONTENT
 * ========================================================= */
.email-content {
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

.email-content-toolbar {
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: .6rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: .5rem;
}

.email-content-toolbar-left,
.email-content-toolbar-right {
    display: flex;
    align-items: center;
    gap: .35rem;
}

.email-content-header {
    padding: 1.25rem 1.5rem 1rem;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.email-content-title {
    margin: 0 0 .25rem;
    font-size: 20px;
    font-weight: 600;
    line-height: 1.3;
}

.email-content-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .4rem .75rem;
    color: var(--text-muted);
    font-size: 13px;
    margin-top: .35rem;
}

.email-content-meta strong { color: var(--text); font-weight: 500; }

.email-content-meta-divider {
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--text-subtle);
}

.email-content-attachments-hint {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .2rem .6rem;
    border-radius: 999px;
    background: var(--primary-soft);
    color: var(--primary);
    font-size: 12px;
    font-weight: 500;
    text-decoration: none;
    border: 1px solid rgba(79, 70, 229, .25);
    transition: background-color .15s ease, color .15s ease, border-color .15s ease;
}

.email-content-attachments-hint:hover {
    background: rgba(79, 70, 229, .15);
    border-color: rgba(79, 70, 229, .45);
    color: var(--primary-hover);
}

.email-content-body {
    padding: 1.5rem 1.75rem 2.5rem;
    background: var(--surface);
    color: var(--text);
    line-height: 1.65;
    font-size: 14px;
}

.email-content-body img { max-width: 100%; height: auto; }
.email-content-body a { color: var(--primary); }
.email-content-body blockquote {
    border-left: 3px solid var(--border-strong);
    margin: 1em 0;
    padding: .25em 1em;
    color: var(--text-muted);
    background: var(--surface-muted);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.email-content-body pre,
.email-content-body code {
    font-family: var(--font-mono);
    font-size: 13px;
    background: var(--surface-muted);
    border-radius: var(--radius-sm);
}
.email-content-body pre { padding: .75rem 1rem; overflow-x: auto; }
.email-content-body code { padding: 1px 5px; }
.email-content-body table { border-collapse: collapse; max-width: 100%; }
.email-content-body th,
.email-content-body td { border: 1px solid var(--border); padding: .35rem .6rem; }

/* =========================================================
 * ATTACHMENTS
 * ========================================================= */
.email-attachments {
    margin: 0;
    padding: 1.25rem 1.75rem 1.5rem;
    background: var(--surface);
    border-top: 1px solid var(--border);
}

.email-attachments-title {
    display: flex;
    align-items: center;
    gap: .45rem;
    margin: 0 0 .75rem;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .04em;
}

.email-attachments-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
}

.email-attachment {
    display: inline-flex;
    align-items: center;
    gap: .55rem;
    max-width: 280px;
    padding: .5rem .75rem;
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text);
    font-size: 13px;
    text-decoration: none;
    transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}

.email-attachment:hover {
    background: var(--primary-soft);
    border-color: rgba(79, 70, 229, .35);
    color: var(--primary);
}

.email-attachment-icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: var(--surface);
    border: 1px solid var(--border);
    display: grid;
    place-items: center;
    color: var(--text-muted);
    flex-shrink: 0;
}
.email-attachment-icon svg { width: 14px; height: 14px; }
.email-attachment:hover .email-attachment-icon { color: var(--primary); }

.email-attachment-icon--image { color: #0ea5e9; }
.email-attachment-icon--pdf { color: #ef4444; }
.email-attachment-icon--archive { color: #f59e0b; }
.email-attachment-icon--audio,
.email-attachment-icon--video { color: #8b5cf6; }
.email-attachment-icon--text { color: #10b981; }

.email-attachment-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.email-content-empty {
    display: grid;
    place-items: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
    padding: 2rem;
}

/* =========================================================
 * RESPONSIVE
 * ========================================================= */
@media (min-width: 900px) {
    .app-shell {
        grid-template-rows: var(--header-height) 1fr;
    }
    .app-content {
        grid-template-columns: var(--nav-width) var(--list-width) 1fr;
    }
    .app-nav {
        display: flex;
    }
    .nav-toggle { display: none; }

    /* Mobile-only helpers when we have the real layout */
    .hide-on-desktop { display: none !important; }
}

@media (max-width: 899px) {
    .app-nav {
        position: absolute;
        inset: 0;
        z-index: 10;
        box-shadow: var(--shadow-lg);
        width: 280px;
    }
    .app-nav.is-open ~ .app-list,
    .app-nav.is-open ~ .app-main {
        opacity: .35;
        pointer-events: none;
    }

    .show-on-mobile { display: inline-flex !important; }

    .email-content-header { padding: 1rem 1rem .85rem; }
    .email-content-body { padding: 1rem 1rem 1.5rem; }
    .email-attachments { padding: 1rem 1rem 1.25rem; }
    .email-attachment { max-width: 100%; }
}

/* Backdrop for mobile nav */
.nav-backdrop {
    display: none;
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, .35);
    z-index: 9;
}
.nav-backdrop.is-open { display: block; }