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

/* ========== БАЗОВЫЕ ПЕРЕМЕННЫЕ ========== */
:root {
    /* Тёмная тема (по умолчанию) */
    --bg-dark: #0a0c15;
    --bg-darker: #05070e;
    --glass-dark: rgba(15, 25, 45, 0.75);
    --glass-border-dark: rgba(0, 255, 255, 0.25);
    --neon-cyan: #0ff;
    --neon-purple: #b6b;
    --text-primary-dark: #eef5ff;
    --text-secondary-dark: #8a9bb5;
    --success-dark: #00ff88;
    --error-dark: #ff4466;
    --accent-glow-dark: 0 0 5px #0ff, 0 0 10px #0ff;
}

body.dark-theme {
    --bg-body: radial-gradient(ellipse at 20% 30%, #0a1120, #03050a);
    --glass: var(--glass-dark);
    --glass-border: var(--glass-border-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --neon: var(--neon-cyan);
    --accent-glow: var(--accent-glow-dark);
    --success: var(--success-dark);
    --error: var(--error-dark);
    --card-bg: rgba(0, 0, 0, 0.4);
    --input-bg: rgba(0, 0, 0, 0.6);
}

/* Светлая тема (космическая с золотом) */
body.light-theme {
    --bg-body: radial-gradient(ellipse at 20% 30%, #f5f0e6, #e8e0d0);
    --glass: rgba(245, 240, 230, 0.85);
    --glass-border: rgba(212, 175, 55, 0.4);
    --text-primary: #2a2418;
    --text-secondary: #5a4e3a;
    --neon: #d4af37;
    --accent-glow: 0 0 8px #d4af37, 0 0 15px #d4af37;
    --success: #2e7d32;
    --error: #c62828;
    --card-bg: rgba(255, 255, 245, 0.5);
    --input-bg: rgba(255, 255, 245, 0.7);
}

body {
    font-family: 'Segoe UI', 'Poppins', 'Orbitron', system-ui, sans-serif;
    background: var(--bg-body);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background 0.3s ease, color 0.2s ease;
}

/* Звёздный фон */
.stars, .twinkling, .cosmic-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}
.stars {
    background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI0MCIgaGVpZ2h0PSI0MCI+PGNpcmNsZSBjeD0iMiIgY3k9IjIiIHI9IjEiIGZpbGw9IndoaXRlIi8+PC9zdmc+') repeat;
    opacity: 0.5;
}
body.light-theme .stars {
    opacity: 0.2;
}
.twinkling {
    background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI2MCIgaGVpZ2h0PSI2MCI+PHBvbHlnb24gcG9pbnRzPSI1LDEgNyw1IDExLDcgNyw5IDUsMTMgMyw5IC0xLDcgMyw1IiBmaWxsPSIjZmZmIi8+PC9zdmc+') repeat;
    animation: twinkle 4s infinite;
}
@keyframes twinkle { 0%{opacity:0.2} 50%{opacity:0.8} 100%{opacity:0.2} }
.cosmic-glow {
    background: radial-gradient(circle at 50% 50%, rgba(0,100,255,0.05) 0%, transparent 70%);
}
body.light-theme .cosmic-glow {
    background: radial-gradient(circle at 50% 50%, rgba(212,175,55,0.08) 0%, transparent 70%);
}

.glass-panel {
    background: var(--glass);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 32px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2), 0 0 0 1px rgba(255,255,255,0.05) inset;
    transition: all 0.3s ease;
}

.neon-btn, .neon-btn-small {
    background: transparent;
    border: 1px solid var(--neon);
    color: var(--neon);
    padding: 0.6rem 1.5rem;
    border-radius: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.2s;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.neon-btn:hover, .neon-btn-small:hover {
    background: var(--neon);
    color: var(--bg-dark);
    box-shadow: var(--accent-glow);
}
.neon-btn-small {
    padding: 0.3rem 1rem;
    font-size: 0.8rem;
}

.demo-btn {
    background: linear-gradient(135deg, #ffaa44, #ff8844);
    border: none;
    color: #2a2418;
    padding: 0.6rem 1.5rem;
    border-radius: 40px;
    font-weight: bold;
    cursor: pointer;
    margin-top: 0.5rem;
    width: 100%;
}
.demo-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 0 12px #ffaa44;
}

/* Контейнеры */
.app-container, .auth-container {
    max-width: 1600px;
    margin: 1.5rem auto;
    padding: 1rem;
    position: relative;
    z-index: 2;
}
.auth-container {
    max-width: 500px;
    margin: 5vh auto;
}

/* Шапка */
.app-header, .auth-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    background: var(--card-bg);
    border-radius: 60px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.logo-icon { font-size: 2rem; }
.logo-text { font-size: 1.5rem; font-weight: bold; }
.logo-accent { color: var(--neon); }
.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--card-bg);
    padding: 0.3rem 1rem;
    border-radius: 40px;
}
.user-avatar { font-size: 1.8rem; }
.user-details { line-height: 1.2; }
.user-name { font-weight: bold; }
.user-username { font-size: 0.7rem; color: var(--text-secondary); }
.demo-badge {
    background: #ffaa44;
    color: #2a2418;
    font-size: 0.6rem;
    padding: 0.1rem 0.4rem;
    border-radius: 20px;
    margin-left: 0.5rem;
}
.language-selector select {
    background: var(--input-bg);
    color: var(--text-primary);
    border: 1px solid var(--neon);
    border-radius: 20px;
    padding: 0.3rem 0.8rem;
}
.icon-btn, .theme-icon-btn {
    background: transparent;
    border: 1px solid var(--neon);
    font-size: 1.2rem;
    padding: 0.4rem 0.7rem;
    border-radius: 50%;
    cursor: pointer;
    color: var(--neon);
}
.icon-btn:hover, .theme-icon-btn:hover {
    background: var(--neon);
    color: #000;
}

/* Вкладки */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}
.tab-btn {
    background: var(--card-bg);
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 40px;
    color: var(--text-primary);
    cursor: pointer;
    backdrop-filter: blur(4px);
    transition: 0.2s;
}
.tab-btn.active {
    background: var(--neon);
    color: var(--bg-dark);
    box-shadow: var(--accent-glow);
}

/* Основной layout */
.main-layout {
    display: flex;
    gap: 1rem;
    min-height: 65vh;
}
@media (max-width: 768px) {
    .main-layout { flex-direction: column; }
}

/* Панель файлов */
.files-panel {
    width: 280px;
    padding: 1rem;
    overflow-y: auto;
}
@media (max-width: 768px) {
    .files-panel { width: 100%; max-height: 200px; }
}
.files-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}
.file-item {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 0.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.file-checkbox { transform: scale(1.2); margin-right: 0.5rem; }
.file-info { flex: 1; overflow: hidden; }
.file-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-size { font-size: 0.7rem; color: var(--text-secondary); }
.delete-file {
    background: none;
    border: none;
    color: var(--error);
    cursor: pointer;
    font-size: 1rem;
}

/* Чат */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
}
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 24px;
    margin-bottom: 1rem;
}
.message {
    margin-bottom: 1rem;
    padding: 0.8rem 1rem;
    border-radius: 20px;
    max-width: 85%;
    word-wrap: break-word;
}
.user-message {
    background: linear-gradient(135deg, #0a4a6a, #0a2a3a);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}
body.light-theme .user-message {
    background: linear-gradient(135deg, #d4af37, #b8962e);
    color: #2a2418;
}
.assistant-message {
    background: rgba(0, 255, 255, 0.1);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}
body.light-theme .assistant-message {
    background: rgba(212, 175, 55, 0.15);
}
.input-area {
    background: var(--card-bg);
    border-radius: 30px;
    padding: 1rem;
}
#userMessage {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--neon);
    color: var(--text-primary);
    border-radius: 24px;
    padding: 0.8rem;
    resize: vertical;
}
.input-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}
.selected-files {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}
.selected-file-badge {
    background: rgba(0,255,255,0.2);
    border-radius: 20px;
    padding: 0.2rem 0.6rem;
    font-size: 0.7rem;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}
body.light-theme .selected-file-badge {
    background: rgba(212,175,55,0.2);
}
.remove-selected {
    cursor: pointer;
    color: var(--error);
}

/* База данных, облака, профиль */
.db-panel, .cloud-panel, .profile-panel {
    padding: 1.5rem;
    max-width: 700px;
    margin: 0 auto;
    width: 100%;
}
.form-group {
    margin-bottom: 1rem;
}
.form-group label {
    display: block;
    margin-bottom: 0.3rem;
    font-weight: 500;
}
input, select, textarea {
    background: var(--input-bg);
    border: 1px solid var(--neon);
    border-radius: 20px;
    padding: 0.6rem 1rem;
    color: var(--text-primary);
    width: 100%;
}
.cloud-services {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}
.db-result, #profileResult {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 16px;
    font-family: monospace;
}
.demo-warning {
    background: #ffaa4433;
    border-left: 3px solid #ffaa44;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border-radius: 8px;
}

/* Модалки */
.modal, .legal-modal, .cookie-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(8px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}
.modal-content, .legal-content, .cookie-content {
    background: var(--glass);
    border: 1px solid var(--neon);
    border-radius: 32px;
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}
.close, .close-legal {
    float: right;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--neon);
}

/* Адаптив */
@media (max-width: 640px) {
    .app-header { flex-direction: column; align-items: stretch; }
    .user-info { justify-content: space-between; }
    .tabs { flex-wrap: wrap; }
    .tab-btn { flex: 1; text-align: center; }
    .message { max-width: 95%; }
    .form-row { flex-direction: column; }
    .modal-content { padding: 1rem; }
}

/* Стили для маркетинговой страницы */
.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
}
.theme-switch {
    margin-top: 1rem;
}
.theme-btn {
    background: transparent;
    border: 1px solid var(--neon);
    color: var(--neon);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    cursor: pointer;
}