:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --error-color: #EF4444;
    --success-color: #10B981;
    --bg-color: #F3F4F6;
    --card-bg: #FFFFFF;
    --text-main: #1F2937;
    --text-muted: #6B7280;
    --input-border: #D1D5DB;
    --input-bg: #FFFFFF;
    --drop-gradient-1: #ffffff;
    --drop-gradient-2: #f8f9fa;
    --glow-purple: rgba(79, 70, 229, 0.15);
    --glow-green: rgba(16, 185, 129, 0.12);
}

[data-theme="dark"] {
    --primary-color: #818CF8;
    --primary-hover: #6366F1;
    --error-color: #F87171;
    --success-color: #34D399;
    --bg-color: #111827;
    --card-bg: #1F2937;
    --text-main: #F9FAFB;
    --text-muted: #9CA3AF;
    --input-border: #374151;
    --input-bg: #374151;
    --drop-gradient-1: #1F2937;
    --drop-gradient-2: #111827;
    --glow-purple: rgba(129, 140, 248, 0.2);
    --glow-green: rgba(52, 211, 153, 0.15);
}

/* Yuxarı idarəetmə düymələri */
.top-controls {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
    display: flex;
    gap: 10px;
    align-items: center;
}

/* Dil dəyişdirmə düyməsi */
.lang-toggle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: var(--card-bg);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
    padding: 0;
    margin: 0;
}

.lang-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.lang-toggle .lang-text {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-main);
    letter-spacing: 0.5px;
}

/* Tema dəyişdirmə düyməsi */
.theme-toggle {
    position: relative;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: var(--card-bg);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.theme-toggle svg {
    width: 24px;
    height: 24px;
    color: var(--text-main);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.theme-toggle .icon-moon {
    position: absolute;
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .theme-toggle .icon-sun {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="dark"] .theme-toggle .icon-moon {
    opacity: 1;
    transform: rotate(0deg);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background:
        radial-gradient(circle at 10% 10%, var(--glow-purple), transparent 35%),
        radial-gradient(circle at 90% 90%, var(--glow-green), transparent 40%),
        var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    position: relative;
    overflow: hidden;
    transition: background 0.4s ease;
}

body::before,
body::after {
    content: '';
    position: fixed;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    filter: blur(70px);
    z-index: 0;
    pointer-events: none;
}

body::before {
    top: -60px;
    left: -40px;
    background: rgba(79, 70, 229, 0.25);
}

body::after {
    right: -50px;
    bottom: -70px;
    background: rgba(16, 185, 129, 0.22);
}

#gravityBg {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 14px 32px rgba(31, 41, 55, 0.12);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    width: 100%;
    max-width: 450px;
    transition: transform 0.3s ease, background 0.3s ease;
    position: relative;
    z-index: 1;
}

.card:hover {
    transform: translateY(-5px);
}

h2 {
    color: var(--text-main);
    text-align: center;
    margin-bottom: 10px;
    font-size: 24px;
}

h2.main-title {
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #4F46E5 0%, #7C3AED 50%, #10B981 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 4s ease infinite;
    text-shadow: 0 2px 10px rgba(79, 70, 229, 0.15);
    position: relative;
}

h2.main-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    margin: 12px auto 0;
    border-radius: 2px;
    background: linear-gradient(90deg, #4F46E5, #10B981);
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

p.subtitle {
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 30px;
    font-size: 14px;
}

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

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-main);
    font-weight: 500;
    font-size: 14px;
}

input[type="email"] {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    background: var(--input-bg);
    color: var(--text-main);
    transition: border-color 0.3s, background 0.3s;
}

input[type="email"]::placeholder {
    color: var(--text-muted);
}

input[type="email"]:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--glow-purple);
}

.file-drop-area {
    border: 2px dashed var(--input-border);
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    cursor: pointer;
    position: relative;
    backdrop-filter: blur(2px);
    background: linear-gradient(145deg, var(--drop-gradient-1), var(--drop-gradient-2));
    box-shadow:
        0 4px 15px rgba(0, 0, 0, 0.06),
        0 1px 3px rgba(0, 0, 0, 0.04),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition:
        border-color 0.3s ease,
        background 0.3s ease,
        transform 0.25s ease,
        box-shadow 0.25s ease;
}

.file-drop-area:hover, .file-drop-area.active {
    border-color: var(--primary-color);
    background: linear-gradient(145deg, var(--drop-gradient-1), var(--card-bg));
    transform: translateY(-4px) scale(1.02);
    box-shadow:
        0 12px 28px var(--glow-purple),
        0 4px 10px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.file-drop-area.success {
    border: 2px solid var(--success-color);
    background-color: rgba(16, 185, 129, 0.08);
    pointer-events: none;
    cursor: default;
}

.file-drop-area.success .success-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--success-color);
    font-weight: 600;
    font-size: 15px;
}

.file-drop-area.success .success-icon svg {
    width: 48px;
    height: 48px;
    fill: var(--success-color);
}

.file-drop-area span {
    color: var(--text-muted);
    font-size: 14px;
}

.file-drop-area input[type="file"] {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

button {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
    margin-top: 10px;
}

button:hover {
    filter: brightness(1.03);
}

button:disabled {
    background-color: #9CA3AF;
    cursor: not-allowed;
}

.message {
    margin-top: 20px;
    padding: 12px;
    border-radius: 8px;
    text-align: center;
    font-size: 14px;
    display: none;
    font-weight: 500;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.message.error {
    display: block;
    background-color: #FEE2E2;
    color: var(--error-color);
    border: 1px solid #FCA5A5;
}

.message.success {
    display: block;
    background-color: #D1FAE5;
    color: var(--success-color);
    border: 1px solid #6EE7B7;
}

#fileName {
    display: block;
    margin-top: 10px;
    font-weight: 600;
    color: var(--primary-color);
    word-break: break-all;
}

/* ==================== CHATBOT ==================== */

.chatbot-toggle {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 200;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.35);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.chatbot-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 28px rgba(79, 70, 229, 0.45);
}

.chatbot-toggle svg {
    width: 28px;
    height: 28px;
    color: white;
    transition: opacity 0.2s ease, transform 0.3s ease;
}

.chatbot-toggle .close-icon {
    position: absolute;
    opacity: 0;
    transform: rotate(-90deg);
}

.chatbot-toggle.active .chat-icon {
    opacity: 0;
    transform: rotate(90deg);
}

.chatbot-toggle.active .close-icon {
    opacity: 1;
    transform: rotate(0deg);
}

.chatbot-window {
    position: fixed;
    bottom: 100px;
    right: 24px;
    z-index: 199;
    width: 380px;
    max-width: calc(100vw - 48px);
    height: 500px;
    max-height: calc(100vh - 140px);
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.95);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}

.chatbot-window.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.chatbot-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chatbot-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 15px;
}

.chatbot-close {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    padding: 4px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.chatbot-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.chatbot-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    background: var(--bg-color);
}

.chat-message {
    max-width: 85%;
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 14px;
    line-height: 1.5;
    word-wrap: break-word;
}

.chat-message.user {
    align-self: flex-end;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border-bottom-right-radius: 4px;
}

.chat-message.bot {
    align-self: flex-start;
    background: var(--card-bg);
    color: var(--text-main);
    border-bottom-left-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.chat-message.bot.typing {
    display: flex;
    gap: 4px;
    padding: 16px 20px;
}

.chat-message.bot.typing .dot {
    width: 8px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typingDot 1.4s infinite ease-in-out;
}

.chat-message.bot.typing .dot:nth-child(2) {
    animation-delay: 0.2s;
}

.chat-message.bot.typing .dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingDot {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.6;
    }
    30% {
        transform: translateY(-6px);
        opacity: 1;
    }
}

.chatbot-input-area {
    padding: 12px 16px;
    background: var(--card-bg);
    border-top: 1px solid var(--input-border);
    display: flex;
    gap: 10px;
    align-items: center;
}

#chatInput {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--input-border);
    border-radius: 24px;
    font-size: 14px;
    outline: none;
    background: var(--input-bg);
    color: var(--text-main);
    transition: border-color 0.3s;
}

#chatInput::placeholder {
    color: var(--text-muted);
}

#chatInput:focus {
    border-color: var(--primary-color);
}

.chat-send-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, box-shadow 0.2s;
    flex-shrink: 0;
}

.chat-send-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.chat-send-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Mobile responsive */
@media (max-width: 480px) {
    .chatbot-window {
        bottom: 0;
        right: 0;
        left: 0;
        width: 100%;
        max-width: 100%;
        height: calc(100vh - 80px);
        max-height: none;
        border-radius: 16px 16px 0 0;
    }
    
    .chatbot-toggle {
        bottom: 16px;
        right: 16px;
    }
    
    .chatbot-toggle.active {
        bottom: calc(100vh - 60px);
        z-index: 250;
    }
    
    .chatbot-input-area {
        padding: 10px 12px;
        gap: 8px;
    }
    
    #chatInput {
        font-size: 16px; /* Prevents iOS zoom */
        padding: 10px 14px;
        min-width: 0;
    }
    
    .chat-send-btn {
        width: 44px;
        height: 44px;
        min-width: 44px;
        flex-shrink: 0;
    }
}