/* متغیرهای رنگی و تنظیمات پایه */
:root {
    --bg-main: #0a0a0a;
    --bg-secondary: #171717;
    --bg-glass: rgba(23, 23, 23, 0.7);
    --text-primary: #f5f5f5;
    --text-secondary: #a3a3a3;
    --accent: #4f46e5;
    --accent-hover: #4338ca;
    --border-color: #262626;
}

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

body {
    font-family: 'Vazirmatn', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.8;
    overflow-x: hidden;
}

/* نوار پیشرفت مطالعه */
#progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background-color: var(--accent);
    transform-origin: right;
    transform: scaleX(0);
    z-index: 100;
    transition: transform 0.1s ease-out;
}

/* ساختار مقاله */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 5rem 2rem;
    display: flex;
    position: relative;
}

.article-content {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    animation: fadeIn 1s ease-out;
}

header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 2rem;
    margin-bottom: 3rem;
}

.meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 900;
    line-height: 1.3;
    margin-bottom: 2rem;
}

p {
    margin-bottom: 1.5rem;
    color: #d4d4d4;
    font-size: 1.1rem;
}

.spacer-text {
    height: 1000px;
    border-left: 2px dashed var(--border-color);
    padding-left: 1rem;
    color: #737373;
}

/* دکمه شناور */
.ai-fab {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: #ffffff;
    color: var(--bg-main);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.1);
    z-index: 40;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.3s;
}

.ai-fab:hover {
    transform: scale(1.05) translateY(-5px);
}

.ai-fab.hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.8);
}

/* سایدبار هوش مصنوعی */
.ai-sidebar {
    position: fixed;
    top: 0;
    right: -400px;
    width: 100%;
    max-width: 400px;
    height: 100vh;
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    z-index: 50;
    display: flex;
    flex-direction: column;
    transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
}

.ai-sidebar.open {
    right: 0;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
}

.header-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: #10b981;
    border-radius: 50%;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: background 0.2s, color 0.2s;
}

.close-btn:hover {
    background: var(--border-color);
    color: white;
}

/* بخش پیام‌ها */
.chat-area {
    flex: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    max-width: 85%;
    padding: 1rem;
    border-radius: 1rem;
    font-size: 0.95rem;
    animation: slideUp 0.3s ease-out;
}

.message.ai {
    background-color: var(--border-color);
    color: var(--text-primary);
    align-self: flex-start;
    border-bottom-right-radius: 0;
}

.message.user {
    background-color: var(--accent);
    color: white;
    align-self: flex-end;
    border-bottom-left-radius: 0;
}

/* ورودی متن چت */
.input-area {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
}

.chat-form {
    display: flex;
    position: relative;
}

.chat-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3.5rem;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    color: white;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
}

.chat-input:focus {
    border-color: var(--accent);
}

.send-btn {
    position: absolute;
    left: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--accent);
    color: white;
    border: none;
    border-radius: 0.5rem;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

/* پس‌زمینه تاریک‌کننده برای موبایل */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 45;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* انیمیشن‌های کلیدی */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}