@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg-primary: #0f172a;
    --bg-secondary: rgba(30, 41, 59, 0.7);
    --bg-tertiary: rgba(51, 65, 85, 0.5);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(12px);
    --danger: #ef4444;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Login Screen */
#login-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 100;
    transition: opacity 0.5s ease;
}

#login-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.login-box {
    background: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    padding: 3rem;
    border-radius: 20px;
    border: 1px solid var(--border);
    text-align: center;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.login-box h1 {
    margin-bottom: 2rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* Main Layout */
#app-container {
    display: flex;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease;
}

#app-container.visible {
    opacity: 1;
}

/* Sidebar */
#sidebar {
    width: 250px;
    background: var(--bg-secondary);
    backdrop-filter: var(--glass-blur);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1rem;
}

.brand {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.mailbox-item {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.2s;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.mailbox-item:hover, .mailbox-item.active {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-primary {
    background: var(--accent);
    color: white;
    border: none;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: auto;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

/* Thread List (Middle Pane) */
#thread-list {
    width: 350px;
    background: rgba(15, 23, 42, 0.95);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.pane-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.thread-items-container {
    flex: 1;
    overflow-y: auto;
}

.thread-cell {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background 0.2s;
}

.thread-cell:hover, .thread-cell.active {
    background: var(--bg-tertiary);
}

.thread-sender {
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.thread-topic {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.thread-preview {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Reading Pane (Right Pane) */
#reading-pane {
    flex: 1;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
}

.empty-state {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.email-messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.email-bubble {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    max-width: 800px;
}

.email-bubble.sent {
    background: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.2);
    align-self: flex-end;
}

.email-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.email-body {
    line-height: 1.6;
    white-space: pre-wrap;
    font-size: 0.95rem;
}

.reply-bar {
    padding: 1rem 2rem;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

/* Modal Composer */
#compose-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: var(--glass-blur);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 50;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

#compose-modal.visible {
    opacity: 1;
    pointer-events: all;
}

.compose-box {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 12px;
    width: 600px;
    max-width: 90vw;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.compose-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-secondary);
    font-weight: 600;
}

.compose-header button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
}

.compose-header button:hover {
    color: var(--text-primary);
}

.compose-form {
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
}

.compose-form input, .compose-form textarea {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    color: var(--text-primary);
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
}

.compose-form input:focus, .compose-form textarea:focus {
    border-color: var(--accent);
}

.compose-form textarea {
    min-height: 200px;
    resize: vertical;
}

.compose-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.2s;
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
}

/* User Info */
.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.user-info img {
    width: 24px;
    height: 24px;
    border-radius: 50%;
}