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

:root {
    --font-sans: 'IBM Plex Sans', 'Segoe UI', sans-serif;
    --bg-gradient: linear-gradient(135deg, #e6f4f1 0%, #d9e7f5 100%);
    --panel-bg: #ffffff;
    --surface: #f6f7fb;
    --text: #1f2933;
    --muted: #5f6b76;
    --border: #e5e7eb;
    --header-gradient: linear-gradient(135deg, #2563eb 0%, #0ea5a4 100%);
    --header-text: #ffffff;
    --accent: #2563eb;
    --accent-strong: #1d4ed8;
    --accent-soft: rgba(37, 99, 235, 0.15);
    --success: #16a34a;
    --success-bg: #dcfce7;
    --success-border: #86efac;
    --error: #b91c1c;
    --error-bg: #fee2e2;
    --error-border: #fecaca;
    --shadow: rgba(15, 23, 42, 0.2);
    --link: #2563eb;
    --link-hover: #0ea5a4;
    --button-secondary-bg: #e2e8f0;
    --button-secondary-text: #1f2933;
    --button-secondary-hover: #cbd5e1;
}

body.theme-dark {
    --bg-gradient: linear-gradient(135deg, #0f172a 0%, #111827 100%);
    --panel-bg: #0b1220;
    --surface: #0f172a;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #1f2937;
    --header-gradient: linear-gradient(135deg, #0f766e 0%, #1e40af 100%);
    --header-text: #f8fafc;
    --accent: #38bdf8;
    --accent-strong: #0ea5e9;
    --accent-soft: rgba(56, 189, 248, 0.2);
    --success: #22c55e;
    --success-bg: rgba(34, 197, 94, 0.15);
    --success-border: rgba(34, 197, 94, 0.5);
    --error: #f87171;
    --error-bg: rgba(248, 113, 113, 0.15);
    --error-border: rgba(248, 113, 113, 0.5);
    --shadow: rgba(0, 0, 0, 0.45);
    --link: #38bdf8;
    --link-hover: #22d3ee;
    --button-secondary-bg: #1f2937;
    --button-secondary-text: #e5e7eb;
    --button-secondary-hover: #374151;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-gradient);
    min-height: 100vh;
    padding: 20px;
    color: var(--text);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--panel-bg);
    border-radius: 12px;
    box-shadow: 0 20px 60px var(--shadow);
    overflow: hidden;
}

header {
    background: var(--header-gradient);
    color: var(--header-text);
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 32px;
    margin-bottom: 10px;
}

header p {
    opacity: 0.92;
    font-size: 16px;
}

.header-actions {
    margin-top: 16px;
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.header-top > div:first-child {
    flex: 1;
    text-align: left;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
    white-space: nowrap;
    background: rgba(255, 255, 255, 0.15);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
}

.user-info #logoutBtn {
    margin: 0;
    padding: 6px 12px;
    font-size: 13px;
}

@media (max-width: 600px) {
    .header-top {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-top > div:first-child {
        width: 100%;
    }
    
    .user-info {
        width: 100%;
        justify-content: space-between;
    }
}

.lang-select {
    padding: 10px 14px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--panel-bg);
    color: var(--text);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
}

.lang-select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

section {
    padding: 40px 30px;
    border-bottom: 1px solid var(--border);
}

section:last-of-type {
    border-bottom: none;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
    font-family: inherit;
    color: var(--text);
    background: var(--panel-bg);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--muted);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-group input.field-locked {
    background: var(--surface);
    cursor: not-allowed;
    opacity: 0.85;
}

/* Кнопки */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover {
    background: var(--accent-strong);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px var(--accent-soft);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: var(--success);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--button-secondary-bg);
    color: var(--button-secondary-text);
}

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

.btn-submit {
    width: 100%;
    padding: 14px;
    background: var(--header-gradient);
    color: white;
    font-size: 18px;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px var(--accent-soft);
}

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

/* Чекбокс */
.checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
}

.checkbox input {
    width: auto;
    margin: 0;
}

.checkbox label {
    margin: 0;
    font-weight: 400;
}

/* Сообщения */
.message {
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
}

.message h3 {
    margin-bottom: 10px;
    font-size: 20px;
}

.message.success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
}

.message.error {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid var(--error-border);
}

/* Статистика */
.queue-section h2 {
    margin-bottom: 20px;
    color: var(--text);
}

#queueStats {
    background: var(--surface);
    padding: 20px;
    border-radius: 8px;
    font-size: 16px;
    line-height: 1.6;
}

/* Футер */
footer {
    background: var(--surface);
    padding: 20px;
    text-align: center;
    border-top: 1px solid var(--border);
}

footer a {
    color: var(--link);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

footer a:hover {
    color: var(--link-hover);
}

/* Мобильная адаптация */
@media (max-width: 600px) {
    header {
        padding: 30px 20px;
    }

    header h1 {
        font-size: 24px;
    }

    section {
        padding: 25px 20px;
    }

    .btn-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}