:root {
    --bg-color: #121212;
    --card-bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --text-color-secondary: #a0a0a0;
    --border-color: #333;
    --accent-color: #ffffff;
    --accent-text-color: #121212;
    --danger-color: #e57373;
    --danger-hover-color: #ef5350;
    --success-bg: #2e7d32;
    --error-bg: #c62828;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    line-height: 1.6;
    background-image: url('../images/back.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.header {
    background: rgba(26, 26, 26, 0.7);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 10;
}

.logo {
    font-family: 'Georgia', serif;
    font-size: 26px;
    font-weight: 400;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 20px;
}

.username {
    color: var(--text-color-secondary);
    font-size: 14px;
}

.logout-btn {
    padding: 8px 16px;
    background: transparent;
    color: var(--text-color-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.logout-btn:hover {
    background: var(--danger-color);
    color: var(--accent-text-color);
    border-color: var(--danger-color);
}

.container {
    max-width: 900px;
    margin: 40px auto;
    padding: 0 20px;
}

.card {
    background: rgba(26, 26, 26, 0.75);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 40px;
    border: 1px solid var(--border-color);
    margin-bottom: 30px;
}

.card-title {
    font-family: 'Georgia', serif;
    font-size: 24px;
    font-weight: 400;
    color: var(--text-color);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
    margin-bottom: 25px;
}

.form-group {
    margin-bottom: 0;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

label {
    display: block;
    color: var(--text-color-secondary);
    margin-bottom: 10px;
    font-size: 14px;
    font-weight: 500;
}

input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-color);
    border-radius: 8px;
    font-size: 15px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

textarea {
    resize: vertical;
    min-height: 120px;
    font-family: inherit;
}

.editor-container {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    background-color: var(--bg-color);
}

.editor-container:focus-within {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

.ql-snow {
    border: none;
    color: var(--text-color);
}

.ql-toolbar.ql-snow {
    border-bottom: 1px solid var(--border-color);
}

.ql-toolbar.ql-snow .ql-picker-label {
    color: var(--text-color-secondary);
}
.ql-toolbar.ql-snow .ql-stroke {
    stroke: var(--text-color-secondary);
}
.ql-toolbar.ql-snow .ql-fill {
    fill: var(--text-color-secondary);
}

#editor {
    min-height: 300px;
}

.format-buttons {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.format-btn {
    padding: 8px 16px;
    background: transparent;
    color: var(--text-color-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    transition: all 0.3s;
}

.format-btn:hover {
    background: var(--border-color);
    color: var(--text-color);
}

.format-btn.active {
    background: var(--accent-color);
    color: var(--accent-text-color);
    border-color: var(--accent-color);
}

.send-btn {
    padding: 14px 40px;
    background: var(--accent-color);
    color: var(--accent-text-color);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.send-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.success-message,
.error-message {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: none;
    color: var(--text-color);
}

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

.error-message {
    background: var(--error-bg);
}

.success-message.show,
.error-message.show {
    display: block;
}

.history-item {
    padding: 15px;
    background: var(--bg-color);
    border-radius: 8px;
    margin-bottom: 10px;
    border: 1px solid var(--border-color);
    transition: border-color 0.3s;
}

.history-item:hover {
    border-color: var(--text-color-secondary);
}

.history-item .time {
    color: var(--text-color-secondary);
    font-size: 12px;
    margin-bottom: 5px;
}

.history-item .subject {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 5px;
}

.history-item .recipients {
    color: var(--text-color-secondary);
    font-size: 14px;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }

    .header {
        padding: 15px 20px;
    }

    .logo {
        font-size: 22px;
    }

    .container {
        padding: 0 15px;
        margin-top: 20px;
    }
    .card {
        padding: 25px;
    }
}