/* === VARIABLES & THEME CONFIGURATION === */
:root {
    /* Light Theme (Default) */
    --primary: #00C853;
    --accent: #00B0FF;
    --bg-body: #f8fffe;
    --bg-card: #ffffff;
    --bg-input: #ffffff;
    --text-main: #2c3e50;
    --text-sec: #666666;
    --border: #ddd;
    --shadow: 0 4px 15px rgba(0,0,0,0.08);
    --gradient: linear-gradient(135deg, var(--primary), var(--accent));
    --nav-bg: rgba(255, 255, 255, 0.98);
    --hover-bg: #f0f0f0;
    --drop-zone: #fafafa;
}

/* Dark Theme Override */
body.dark-mode {
    --bg-body: #121212;
    --bg-card: #1e1e1e;
    --bg-input: #2d2d2d;
    --text-main: #e0e0e0;
    --text-sec: #aaaaaa;
    --border: #333333;
    --shadow: 0 4px 15px rgba(0,0,0,0.5);
    --nav-bg: rgba(30, 30, 30, 0.98);
    --hover-bg: #2d2d2d;
    --drop-zone: #252525;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

a { text-decoration: none; color: inherit; transition: 0.3s; }
ul { list-style: none; }

/* === UTILITIES === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.highlight { color: var(--primary); }

/* === HEADER === */
#header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--nav-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 15px 0;
    transition: background 0.3s;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo span { color: var(--primary); }
.logo i { color: var(--accent); }

.nav-wrapper {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-menu a {
    margin-left: 25px;
    font-weight: 500;
    font-size: 1rem;
    color: var(--text-main);
}
.nav-menu a:hover { color: var(--primary); }

.whatsapp-link {
    background: #25D366;
    color: white !important;
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: 600 !important;
}
.whatsapp-link:hover { background: #1ebc57; }

/* Theme Toggle Button */
.theme-btn {
    background: none;
    border: 2px solid var(--border);
    color: var(--text-main);
    padding: 8px 12px;
    border-radius: 50%;
    cursor: pointer;
    transition: 0.3s;
    font-size: 1rem;
}
.theme-btn:hover { background: var(--primary); border-color: var(--primary); color: white; }

.hamburger { display: none; cursor: pointer; font-size: 1.5rem; color: var(--text-main); }

/* === HERO === */
.hero {
    text-align: center;
    padding: 60px 0 40px;
    background: linear-gradient(to bottom, var(--bg-body), var(--bg-card));
}

.hero h1 { font-size: 2.8rem; margin-bottom: 15px; line-height: 1.2; }
.hero p { font-size: 1.1rem; color: var(--text-sec); margin-bottom: 30px; }

.cta-btn {
    display: inline-block;
    padding: 12px 35px;
    background: var(--gradient);
    color: #fff;
    border-radius: 30px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0, 200, 83, 0.3);
}
.cta-btn:hover { transform: translateY(-2px); opacity: 0.9; }

/* === TOOLS LAYOUT === */
.tools-section { padding: 40px 0; min-height: 80vh; }

.layout-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 30px;
    align-items: start;
}

/* Sidebar Accordion */
.sidebar {
    background: var(--bg-card);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 20px;
    position: sticky;
    top: 100px;
    height: fit-content;
    max-height: 80vh;
    overflow-y: auto;
    border: 1px solid var(--border);
}

.sidebar h3 { 
    margin-bottom: 15px; 
    font-size: 1.2rem; 
    color: var(--accent); 
    border-bottom: 2px solid var(--border); 
    padding-bottom: 10px; 
}

.accordion-item { margin-bottom: 5px; }

.accordion-header {
    width: 100%;
    text-align: left;
    background: var(--bg-body);
    border: none;
    padding: 12px 15px;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    color: var(--text-main);
    transition: 0.2s;
}
.accordion-header i { margin-right: 10px; width: 20px; color: var(--primary); }
.accordion-header:hover { background: var(--hover-bg); }

.accordion-body {
    display: none;
    padding: 5px 0 5px 15px;
}
.accordion-body.active { display: block; }

.tool-btn {
    display: block;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: 8px 10px;
    cursor: pointer;
    color: var(--text-sec);
    font-size: 0.9rem;
    transition: 0.2s;
    border-left: 2px solid transparent;
}
.tool-btn:hover { 
    color: var(--primary); 
    border-left-color: var(--primary); 
    background: var(--hover-bg); 
}

/* Workspace */
.workspace {
    background: var(--bg-card);
    min-height: 500px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 30px;
    position: relative;
    border: 1px solid var(--border);
}

.empty-state {
    text-align: center;
    color: var(--text-sec);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.empty-state i { font-size: 4rem; margin-bottom: 20px; color: var(--border); }

/* === TOOL UI ELEMENTS === */
.tool-title {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--primary);
    border-bottom: 2px solid var(--border);
    padding-bottom: 10px;
}

.tool-group { margin-bottom: 20px; }
label { display: block; margin-bottom: 8px; font-weight: 500; color: var(--text-main); }

input, textarea, select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    background: var(--bg-input);
    color: var(--text-main);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
}
input:focus, textarea:focus { outline: none; border-color: var(--accent); }

.action-btn {
    background: var(--gradient);
    color: #fff;
    border: none;
    padding: 12px 25px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: 0.3s;
    margin-right: 10px;
    margin-top: 10px;
}
.action-btn:hover { opacity: 0.9; transform: translateY(-1px); }

.result-box {
    margin-top: 20px;
    padding: 15px;
    background: var(--bg-body);
    border-left: 4px solid var(--primary);
    border-radius: 4px;
    word-break: break-word;
    color: var(--text-main);
}

/* Specific Tools */
.clock-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 15px;
}
.city-card {
    background: var(--bg-body);
    border: 1px solid var(--border);
    padding: 10px;
    border-radius: 8px;
    text-align: center;
    transition: 0.3s;
}
.city-card:hover { transform: translateY(-3px); border-color: var(--primary); }
.city-time { font-size: 1.1rem; font-weight: 700; color: var(--primary); margin: 5px 0; }
.city-name { color: var(--text-sec); }

.calc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; max-width: 300px; margin: 0 auto; }
.calc-btn { padding: 15px; background: var(--bg-body); color: var(--text-main); border: 1px solid var(--border); font-size: 1.2rem; border-radius: 5px; cursor: pointer; transition:0.2s; }
.calc-btn:hover { background: var(--hover-bg); border-color: var(--primary); }
.calc-btn.op { background: rgba(0, 176, 255, 0.1); color: var(--accent); }
.calc-btn.eq { background: var(--primary); color: white; grid-column: span 2; border:none; }

.drop-zone { 
    border: 2px dashed var(--border); 
    padding: 40px; 
    text-align: center; 
    cursor: pointer; 
    border-radius: 8px; 
    transition: 0.3s; 
    background: var(--drop-zone);
    color: var(--text-sec);
}
.drop-zone:hover { border-color: var(--primary); background: rgba(0, 200, 83, 0.05); }
#preview-img { max-width: 100%; margin-top: 15px; border-radius: 6px; display: none; }

/* === MODALS === */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.7); z-index: 2000;
    display: none; justify-content: center; align-items: center;
    backdrop-filter: blur(5px);
}
.modal-content {
    background: var(--bg-card);
    color: var(--text-main);
    padding: 30px; border-radius: 10px;
    width: 90%; max-width: 500px; position: relative;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    border: 1px solid var(--border);
}
.close-modal {
    position: absolute; top: 10px; right: 15px;
    font-size: 2rem; cursor: pointer; color: var(--text-sec);
}
.close-modal:hover { color: var(--primary); }

/* === FOOTER === */
footer { background: #151515; color: #fff; padding: 50px 0 0; margin-top: 50px; border-top: 4px solid var(--primary); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 40px; padding-bottom: 40px; }
.footer-col h4 { color: var(--primary); margin-bottom: 20px; font-size: 1.2rem; }
.footer-col p { color: #bbb; font-size: 0.9rem; }
.footer-col a { display: block; color: #999; margin-bottom: 10px; }
.footer-col a:hover { color: #fff; padding-left: 5px; }
.footer-bottom { background: #000; text-align: center; padding: 20px; color: #666; font-size: 0.9rem; }

/* === RESPONSIVE === */
@media (max-width: 768px) {
    .layout-grid { grid-template-columns: 1fr; }
    .sidebar { position: static; margin-bottom: 30px; max-height: none; }
    .header-content { flex-direction: row; justify-content: space-between; }
    .nav-menu {
        position: fixed;
        top: 60px; left: 0; width: 100%;
        background: var(--bg-card);
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        display: none;
    }
    .nav-menu.active { display: flex; }
    .nav-menu a { margin: 10px 0; margin-left: 0; }
    .hamburger { display: block; }
    .hero h1 { font-size: 2rem; }
    
    /* Theme btn on mobile */
    .theme-btn { margin-right: 10px; }
}