/* Variables & Tokens */
:root {
    --brand-blue: #0073e6;
    --bg-body: #f8fafc;
    --bg-surface: #ffffff;
    --text-primary: #0f172a;
    --border-color: #e2e8f0;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --shadow: 0 4px 12px rgba(0,0,0,0.05);
}

[data-theme="dark"] {
    --bg-body: #0b1120;
    --bg-surface: #1e293b;
    --text-primary: #f1f5f9;
    --border-color: #334155;
    --glass-bg: rgba(11, 17, 32, 0.8);
    --shadow: 0 4px 12px rgba(0,0,0,0.3);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: 'Plus Jakarta Sans', 'Hind Siliguri', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    transition: all 0.3s ease;
    line-height: 1.6;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Header */
.app-header {
    position: sticky; top: 0; z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}
.header-content { height: 70px; display: flex; align-items: center; justify-content: space-between; }
.logo { font-weight: 700; font-size: 1.2rem; }
.logo span { color: var(--brand-blue); }
.desktop-nav a { margin: 0 15px; text-decoration: none; color: var(--text-primary); font-size: 0.9rem; }

/* Buttons */
.btn-primary { background: var(--brand-blue); color: white; border: none; padding: 10px 20px; border-radius: 8px; cursor: pointer; text-decoration: none; font-weight: 600; }
.btn-primary:active { transform: scale(0.95); }

/* Hero */
.hero { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: center; padding: 80px 0; }
.typing-text { font-size: 2.5rem; font-weight: 800; color: var(--brand-blue); }
.image-wrapper img { width: 100%; border-radius: 50%; border: 5px solid var(--brand-blue); aspect-ratio: 1/1; object-fit: cover; }

/* Bento Grid */
.bento-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 40px; }
.bento-card { background: var(--bg-surface); padding: 30px; border-radius: 20px; border: 1px solid var(--border-color); transition: 0.3s; }
.bento-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.large { grid-column: span 2; }
.medium { grid-column: span 1; }

/* Mobile Bottom Nav */
.mobile-bottom-nav {
    display: none; position: fixed; bottom: 0; width: 100%; height: 65px;
    background: var(--glass-bg); backdrop-filter: blur(15px);
    border-top: 1px solid var(--border-color);
    justify-content: space-around; align-items: center; z-index: 2000;
}
.nav-item { text-decoration: none; color: var(--text-primary); font-size: 0.7rem; display: flex; flex-direction: column; align-items: center; }
/* ১. হিরো ইমেজের সাইজ ফিক্স */
.hero-image {
    display: flex;
    justify-content: center; /* ছবিটিকে ডান কলামের মাঝখানে রাখবে */
}
.image-wrapper {
    width: 100%;
    max-width: 400px; /* ইমেজের সর্বোচ্চ সাইজ কন্ট্রোল করা হলো */
}
.image-wrapper img { 
    width: 100%; 
    border-radius: 50%; 
    border: 5px solid var(--brand-blue); 
    aspect-ratio: 1/1; 
    object-fit: cover; 
}

/* ২. সেকেন্ডারি বাটন ও বাটন স্পেসিং ফিক্স */
.hero-btns {
    display: flex;
    gap: 15px; /* দুটি বাটনের মাঝে ফাঁকা জায়গা */
    margin-top: 25px;
}
.btn-secondary { 
    background: transparent; 
    color: var(--text-primary); 
    border: 2px solid var(--border-color); 
    padding: 10px 20px; 
    border-radius: 8px; 
    cursor: pointer; 
    text-decoration: none; 
    font-weight: 600; 
    transition: 0.3s ease; 
}
.btn-secondary:hover { 
    border-color: var(--brand-blue); 
    color: var(--brand-blue); 
}

/* ৩. হেডারের স্পেসিং ফিক্স */
.header-actions {
    display: flex;
    align-items: center;
    gap: 20px; /* আইটেমগুলোর মাঝে সুন্দর স্পেস তৈরি করবে */
}
#lang-switch, #theme-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: transform 0.2s;
}
#lang-switch:hover, #theme-toggle:hover {
    transform: scale(1.1);
}

/* ৪. টাইপোগ্রাফি ফিক্স */
.subtext { 
    font-size: 1.15rem; /* ফন্ট সাইজ বড় করা হলো */
    color: var(--text-secondary); 
    margin-top: 15px; 
    line-height: 1.7; 
}
.hero-text h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
}

/* Section Base Styles */
.section { margin-top: 100px; padding-top: 40px; }
.section-title { font-size: 2rem; color: var(--text-primary); margin-bottom: 5px; }
.section-subtitle { color: var(--text-secondary); margin-bottom: 30px; font-size: 1.1rem; }
.mt-20 { margin-top: 20px; }
.w-100 { width: 100%; }

/* Portfolio Grid */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}
.portfolio-card {
    position: relative;
    border-radius: var(--radius-md, 16px);
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    group: relative;
}
.portfolio-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    aspect-ratio: 4/3;
    transition: transform 0.5s ease;
}
.portfolio-overlay {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(15, 23, 42, 0.85); /* Dark overlay */
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.portfolio-card:hover img { transform: scale(1.05); }
.portfolio-card:hover .portfolio-overlay { opacity: 1; }
.overlay-content {
    text-align: center;
    color: #ffffff;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}
.portfolio-card:hover .overlay-content { transform: translateY(0); }
.overlay-content h3 { font-size: 1.4rem; margin-bottom: 5px; }
.overlay-content p { font-size: 0.9rem; margin-bottom: 15px; color: #cbd5e1; }
.overlay-btn { border-color: #ffffff; color: #ffffff; }
.overlay-btn:hover { background: #ffffff; color: var(--brand-blue); border-color: #ffffff; }

/* Contact Section */
.contact-split {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
}
.contact-info h2, .contact-form-container h2 {
    margin-bottom: 15px;
}
.contact-details p {
    margin-bottom: 10px;
    font-weight: 500;
}

/* Form Styles */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.form-group input, 
.form-group select, 
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}
.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus {
    outline: none;
    border-color: var(--brand-blue);
    box-shadow: 0 0 0 3px rgba(0, 115, 230, 0.1);
}
/* Dropdown text fix for dark mode */
.form-group select option {
    background: var(--bg-surface);
    color: var(--text-primary);
}

/* Responsive Fixes */
@media (max-width: 768px) {
    .contact-split {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero { grid-template-columns: 1fr; text-align: center; padding: 40px 0; }
    .desktop-nav, .header-actions .btn-primary { display: none; }
    .bento-grid { grid-template-columns: 1fr; }
    .large, .medium { grid-column: span 1; }
    .mobile-bottom-nav { display: flex; }
    body { padding-bottom: 70px; }
}