/* ==========================================================================
   ১. গ্লোবাল ভেরিয়েবল এবং রিসেট (Global Variables & Reset)
   ========================================================================== */
:root {
    --bg-color: #0f172a;          /* ডিপ ডার্ক ব্লু ব্যাকগ্রাউন্ড */
    --card-bg: #1e293b;           /* কার্ড এবং প্যানেলের ব্যাকগ্রাউন্ড */
    --text-primary: #f8fafc;      /* প্রধান লেখার রঙ */
    --text-secondary: #94a3b8;    /* হালকা লেখার রঙ */
    --accent: #6366f1;            /* থিম কালার (Indigo) */
    --accent-hover: #4f46e5;      /* হোভার স্টেট কালার */
    --danger: #ef4444;            /* ইরর বা ওয়ার্নিং কালার */
    --success: #10b981;           /* সফলতার কালার */
    --border-color: #334155;      /* বর্ডার কালার */
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

/* স্মুথ স্ক্রলিং */
html {
    scroll-behavior: smooth;
}

/* ==========================================================================
   ২. অথেনটিকেশন পেজ (লগইন ও রেজিস্ট্রেশন)
   ========================================================================== */
.auth-body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    background-color: var(--bg-color);
}

.auth-container {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    width: 100%;
    max-width: 450px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
}

.auth-container h2 {
    margin-bottom: 20px;
    text-align: center;
    font-size: 24px;
    color: var(--text-primary);
}

.auth-container label {
    font-size: 14px;
    color: var(--text-secondary);
    display: block;
    margin-top: 10px;
}

.auth-container input, 
.auth-container select, 
.auth-container button {
    width: 100%;
    padding: 12px;
    margin: 8px 0 15px 0;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: #0f172a;
    color: #fff;
    font-size: 15px;
    outline: none;
    transition: border-color 0.3s ease;
}

.auth-container input:focus, 
.auth-container select:focus {
    border-color: var(--accent);
}

.auth-container button {
    background: var(--accent);
    cursor: pointer;
    font-weight: bold;
    border: none;
    margin-top: 10px;
    transition: background 0.3s ease;
}

.auth-container button:hover {
    background: var(--accent-hover);
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 15px;
}

.remember-me input {
    width: auto;
    margin: 0;
}

/* অ্যালার্ট মেসেজ */
.alert {
    padding: 12px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 15px;
    text-align: center;
    font-weight: 500;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
    border: 1px solid var(--danger);
}

.success-alert {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
    border: 1px solid var(--success);
}

.auth-container p {
    text-align: center;
    font-size: 14px;
    color: var(--text-secondary);
}

.auth-container p a {
    color: var(--accent);
    text-decoration: none;
}

.auth-container p a:hover {
    text-decoration: underline;
}

/* ==========================================================================
   ৩. মূল সোশ্যাল মিডিয়া লেআউট (৩ কলাম গ্রিড)
   ========================================================================== */
.app-container {
    display: grid;
    grid-template-columns: 280px 1fr 300px;
    max-width: 1250px;
    margin: 0 auto;
    gap: 20px;
    padding: 20px;
    min-height: calc(100vh - 80px);
}

/* ==========================================================================
   ৪. বাম পাশের সাইডবার (Navigation Sidebar)
   ========================================================================== */
.sidebar {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 12px;
    height: fit-content;
    border: 1px solid var(--border-color);
    position: sticky;
    top: 20px;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 30px;
    letter-spacing: 0.5px;
}

.menu a {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-primary);
    text-decoration: none;
    padding: 12px 16px;
    margin-bottom: 8px;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.menu a.active, 
.menu a:hover {
    background: var(--accent);
    color: #fff;
}

.logout-btn {
    margin-top: 20px;
    color: var(--danger) !important;
}

.logout-btn:hover {
    background: rgba(239, 68, 68, 0.1) !important;
}

/* ==========================================================================
   ৫. ফিড, পোস্ট ক্রিয়েটর এবং পোস্ট কার্ড
   ========================================================================== */
.feed {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.post-creator {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.post-creator h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.post-creator textarea {
    width: 100%;
    height: 100px;
    background: #0f172a;
    border: 1px solid var(--border-color);
    color: #fff;
    padding: 12px;
    border-radius: 8px;
    resize: none;
    margin-bottom: 12px;
    outline: none;
    font-size: 15px;
}

.post-creator textarea:focus {
    border-color: var(--accent);
}

.post-creator button {
    background: var(--accent);
    color: white;
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    float: right;
    transition: background 0.3s ease;
}

.post-creator button:hover {
    background: var(--accent-hover);
}

/* পোস্ট কার্ড */
.post-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.post-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.post-mini-avatar {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    object-fit: cover;
    background: #334155;
}

.post-header h4 {
    font-size: 16px;
    color: var(--text-primary);
}

.post-time {
    font-size: 12px;
    color: var(--text-secondary);
}

.post-body p {
    color: var(--text-primary);
    font-size: 15px;
    word-wrap: break-word;
    white-space: pre-line;
}

/* ==========================================================================
   ৬. প্রোফাইল হেডার কার্ড (Facebook Style Overlapping Header)
   ========================================================================== */
.profile-header-card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
}

.cover-container {
    height: 250px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-color: #334155;
}

.profile-meta-container {
    display: flex;
    padding: 20px;
    align-items: flex-end;
    margin-top: -60px;
    position: relative;
    z-index: 2;
}

.profile-avatar-wrapper {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 5px solid var(--card-bg);
    overflow: hidden;
    background: #0f172a;
    flex-shrink: 0;
}

.profile-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-user-details {
    margin-left: 20px;
    margin-bottom: 10px;
}

.profile-user-details h2 {
    font-size: 24px;
    color: var(--text-primary);
    font-weight: bold;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

.username {
    color: var(--accent);
    font-size: 14px;
    margin-bottom: 6px;
    font-weight: 500;
}

.bio-text {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 5px;
}

/* ==========================================================================
   ৭. প্রোফাইল গ্রিড (২ কলাম বিশিষ্ট প্রোফাইল লেআউট)
   ========================================================================== */
.profile-grid {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 20px;
    align-items: start;
    margin-top: 20px;
}

/* উইজেট কার্ড এবং ইনফো লিস্ট */
.widget {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.widget h3 {
    margin-bottom: 15px;
    font-size: 18px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.about-info-list {
    list-style: none;
    padding: 0;
}

.about-info-list li {
    padding: 10px 0;
    font-size: 15px;
    color: var(--text-primary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.about-info-list li strong {
    color: var(--text-secondary);
}

/* প্রোফাইল এডিট ফর্ম এর ডিজাইন */
.edit-profile-form .form-group {
    margin-bottom: 15px;
}

.edit-profile-form label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 5px;
    display: block;
}

.edit-profile-form input[type="text"],
.edit-profile-form select,
.edit-profile-form textarea {
    width: 100%;
    padding: 10px;
    background: #0f172a;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: #fff;
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s;
}

.edit-profile-form input[type="text"]:focus,
.edit-profile-form select:focus,
.edit-profile-form textarea:focus {
    border-color: var(--accent);
}

.form-group-files {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 15px;
}

.form-group-files label {
    font-size: 13px;
    color: var(--text-secondary);
}

.form-group-files input[type="file"] {
    margin-top: 5px;
    display: block;
    width: 100%;
    color: var(--text-secondary);
}

.save-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 12px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    width: 100%;
    transition: background 0.3s;
}

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

/* নো-পোস্ট মেসেজ */
.no-posts {
    text-align: center;
    color: var(--text-secondary);
    padding: 20px;
    background: var(--card-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

/* ==========================================================================
   ৮. ডান পাশের ট্রেন্ডিং প্যানেল
   ========================================================================== */
.right-panel {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 12px;
    height: fit-content;
    border: 1px solid var(--border-color);
    position: sticky;
    top: 20px;
}

.right-panel h3 {
    margin-bottom: 15px;
    font-size: 18px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.right-panel ul {
    list-style: none;
}

.right-panel li {
    padding: 10px 0;
    border-bottom: 1px solid rgba(51, 65, 85, 0.5);
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: color 0.2s ease;
}

.right-panel li:hover {
    color: var(--accent);
}

/* ==========================================================================
   ৯. ফুটার (Footer Section)
   ========================================================================== */
.footer {
    text-align: center;
    padding: 24px;
    background: var(--card-bg);
    color: var(--text-secondary);
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
    font-size: 14px;
}

/* ==========================================================================
   ১০. রেসপনসিভ মিডিয়া কোয়েরি (Responsive Queries for Mobile & Tablet)
   ========================================================================== */

/* ট্যাবলেট এবং ল্যাপটপ স্ক্রিন (লুকানো হবে ট্রেন্ডিং প্যানেল) */
@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 240px 1fr;
    }
    .right-panel {
        display: none;
    }
    .profile-grid {
        grid-template-columns: 1fr; /* ২ কলাম প্রোফাইল সিঙ্গেল কলাম হয়ে যাবে */
    }
}

/* মোবাইল স্ক্রিন (লুকানো হবে সাইডবার ও প্রোফাইল হেডার এলাইনমেন্ট পরিবর্তন হবে) */
@media (max-width: 768px) {
    .app-container {
        grid-template-columns: 1fr;
        padding: 10px;
    }

    .sidebar {
        display: none; /* সাইডবার মোবাইল ভিউতে বন্ধ থাকবে */
    }

    /* মোবাইল ভিউতে কভার ও এভাটার পরিবর্তন */
    .cover-container {
        height: 160px;
    }

    .profile-meta-container {
        flex-direction: column;
        align-items: center;
        margin-top: -50px;
        text-align: center;
        padding: 15px;
    }

    .profile-avatar-wrapper {
        width: 100px;
        height: 100px;
    }

    .profile-user-details {
        margin-left: 0;
        margin-top: 12px;
    }

    .form-group-files {
        flex-direction: column;
        gap: 15px;
    }
}