/* ==================================================== */
/* 1. MAIN SITE STYLES (Navbar, Footer, Theme, etc.) */
/* ==================================================== */

/* Animation Keyframes */
@keyframes fadeIn { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }
@keyframes slideUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulseHeart { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.2); } }

/* Site-wide Theme Variables */
:root {
    --primary-brand-color: #0AF5F5;
    --primary-brand-hover: #08C7C7;
    --secondary-accent-color: #F50AE6;
    --navbar-background-base: #0D0F13;
    --navbar-background-scrolled: rgba(13, 15, 19, 0.88);
    --navbar-text-color: #B0C4DE;
    --navbar-text-hover: #E0FFFF;
    --navbar-link-active: var(--primary-brand-color);
    --dropdown-background: #14181F;
    --dropdown-border: #222831;
    --dropdown-shadow: rgba(10, 245, 245, 0.15);
    --border-radius-main: 8px;
    --border-radius-round: 50%;
    --transition-speed: 0.35s;
    --transition-cubic: cubic-bezier(0.68, -0.6, 0.32, 1.6);
    --font-primary: 'Inter', 'Roboto', sans-serif;
    --font-logo: 'Exo 2', 'Orbitron', sans-serif;
    --background-color: #070914;
    --text-color: #F0F4F8;
    --text-muted: #9BA9C1;
    --card-bg: rgba(15, 20, 35, 0.6);
    --input-bg-color: rgba(25, 30, 50, 0.8);
    --border-color: rgba(0, 229, 255, 0.3);
}
body.light-theme {
    --primary-brand-color: #007CF0;
    --primary-brand-hover: #0059B3;
    --secondary-accent-color: #D9006C;
    --navbar-background-base: #FCFCFD;
    --navbar-background-scrolled: rgba(252, 252, 253, 0.88);
    --navbar-text-color: #2E3A4D;
    --navbar-text-hover: #000000;
    --dropdown-background: #FFFFFF;
    --dropdown-border: #E8EBF0;
    --dropdown-shadow: rgba(0, 124, 240, 0.1);
    --background-color: #F4F6F9;
    --text-color: #1D232C;
    --text-muted: #556278;
    --card-bg: rgba(255, 255, 255, 0.7);
    --input-bg-color: #F0F2F5;
    --border-color: rgba(0, 124, 240, 0.3);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-primary); background-color: var(--background-color); color: var(--text-color); line-height: 1.65; transition: background-color 0.35s ease, color 0.35s ease; min-height: 100vh; display: flex; flex-direction: column; }
body.overlay-active { overflow: hidden; }
main { flex-grow: 1; }

.navbar-1minit-main { background-color: var(--navbar-background-base); padding: 1rem 0; position: fixed; top: 0; left: 0; width: 100%; z-index: 1050; border-bottom: 1px solid var(--dropdown-border); transition: all var(--transition-speed) ease; }
.navbar-1minit-main.scrolled { background-color: var(--navbar-background-scrolled); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); padding: 0.8rem 0; box-shadow: 0 8px 30px rgba(0,0,0,0.2); }
.navbar-container-1minit { width: 100%; max-width: 1400px; margin: 0 auto; padding: 0 2rem; display: flex; justify-content: space-between; align-items: center; }
.navbar-logo-1minit { display: flex; align-items: center; text-decoration: none; }
.logo-image-1minit { height: 42px; width: auto; margin-right: 15px; border-radius: var(--border-radius-round); transition: all 0.5s var(--transition-cubic); border: 2px solid transparent; }
.navbar-logo-1minit:hover .logo-image-1minit { transform: rotate(-15deg) scale(1.12); box-shadow: 0 0 18px var(--primary-brand-color); border-color: var(--primary-brand-color); }
.logo-text-1minit { font-family: var(--font-logo); font-size: 2.6rem; font-weight: 900; line-height: 1; display: flex; align-items: baseline; }
.logo-text-1minit .char-1, .logo-text-1minit .char-M { color: var(--primary-brand-color); transition: transform 0.4s var(--transition-cubic); }
.logo-text-1minit .char-init, .logo-text-1minit .logo-text-tools { font-size: 2.5rem; background: linear-gradient(135deg, var(--navbar-text-hover) 15%, var(--navbar-text-color) 55%, var(--secondary-accent-color) 110%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; transition: letter-spacing 0.4s ease-out, transform 0.4s var(--transition-cubic); }
.navbar-logo-1minit:hover .char-1 { transform: translateY(-5px) rotate(-7deg); } .navbar-logo-1minit:hover .char-M { transform: translateY(-3px) rotate(4deg); } .navbar-logo-1minit:hover .char-init, .navbar-logo-1minit:hover .logo-text-tools { letter-spacing: 1px; transform: skewX(-7deg); }
.navbar-menu-1minit { list-style: none; display: flex; margin: 0; padding: 0; align-items: center; } .navbar-menu-1minit li { margin: 0 18px; }
.nav-link-1minit { color: var(--navbar-text-color); text-decoration: none; font-size: 1.1rem; font-weight: 600; padding: 12px 20px; border-radius: var(--border-radius-main); transition: all var(--transition-speed) ease; position: relative; overflow: hidden; }
.nav-link-1minit::before { content: ""; position: absolute; top: 0; left: -100%; width: 100%; height: 100%; background: linear-gradient(120deg, transparent, rgba(255,255,255,0.18), transparent); transition: left 0.45s ease-in-out; }
.nav-link-1minit:hover::before { left: 100%; }
.nav-link-1minit:hover, .nav-link-1minit.active { color: var(--navbar-text-hover); background-color: rgba(var(--primary-brand-color), 0.22); transform: translateY(-2px); } .nav-link-1minit.active { color: var(--primary-brand-color); }
.navbar-actions-1minit { display: flex; align-items: center; gap: 18px; } .theme-toggle-1minit, .tools-menu-toggle-1minit, .mobile-menu-main-toggle-1minit { background-color: transparent; border: 2px solid var(--dropdown-border); color: var(--navbar-text-color); width: 46px; height: 46px; border-radius: var(--border-radius-round); cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 1.35rem; transition: all var(--transition-speed) ease; }
.theme-toggle-1minit:hover, .tools-menu-toggle-1minit:hover, .mobile-menu-main-toggle-1minit:hover { background-color: var(--primary-brand-color); color: var(--navbar-background-base); border-color: var(--primary-brand-color); transform: scale(1.1) rotate(15deg); }
.theme-toggle-1minit .fa-moon { display: inline-block; } body.light-theme .theme-toggle-1minit .fa-moon { display: none; } .theme-toggle-1minit .fa-sun { display: none; } body.light-theme .theme-toggle-1minit .fa-sun { display: inline-block; }
.tools-dropdown-1minit { position: fixed; top: 0; right: -450px; width: 400px; max-width: 90vw; height: 100vh; background-color: var(--dropdown-background); border-left: 1px solid var(--dropdown-border); box-shadow: -10px 0 35px var(--dropdown-shadow); z-index: 1100; transition: right 0.6s var(--transition-cubic); display: flex; flex-direction: column; overflow: hidden; }
.tools-dropdown-1minit.open { right: 0; } .dropdown-header-1minit { display: flex; justify-content: space-between; align-items: center; padding: 1.3rem 2rem; border-bottom: 1px solid var(--dropdown-border); } .dropdown-header-1minit h4 { margin: 0; font-size: 1.35rem; font-weight: 700; display: flex; align-items: center; gap: 12px; color: var(--navbar-text-hover); } .dropdown-header-1minit h4 i { color: var(--primary-brand-color); }
.close-dropdown-1minit { background: none; border: none; color: var(--navbar-text-color); font-size: 2.1rem; cursor: pointer; transition: all var(--transition-speed) ease; } .close-dropdown-1minit:hover { color: var(--secondary-accent-color); transform: rotate(180deg); }
.tools-list-container-1minit { flex-grow: 1; overflow-y: auto; } .tools-list-1minit { list-style: none; padding: 0; } .tools-list-1minit li a { display: flex; align-items: center; padding: 1rem 2rem; color: var(--navbar-text-color); text-decoration: none; transition: all var(--transition-speed) ease; border-bottom: 1px solid var(--dropdown-border); font-weight: 500; }
.tools-list-1minit li a:hover { background-color: rgba(var(--primary-brand-color), 0.2); color: var(--primary-brand-color); padding-left: 2.5rem; } .tools-list-1minit li a i { margin-right: 18px; width: 24px; text-align: center; color: var(--primary-brand-color); font-size: 1.1rem; }
.overlay-1minit { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(5, 6, 8, 0.75); backdrop-filter: blur(5px); z-index: 1040; opacity: 0; visibility: hidden; transition: all var(--transition-speed) ease; }
.overlay-1minit.active { opacity: 1; visibility: visible; }
.mobile-menu-main-toggle-1minit { display: none; }
@media (max-width: 1024px) { .navbar-menu-1minit { display: none; } .mobile-menu-main-toggle-1minit { display: flex; } }

.footer-1minit-standard { background-color: var(--navbar-background-base); color: var(--navbar-text-color); padding: 4rem 0 2rem 0; border-top: 1px solid var(--dropdown-border); font-size: 0.95rem; }
.footer-container-standard { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.footer-top-standard { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 2.5rem; margin-bottom: 3rem; }
.footer-logo-link-standard { display: inline-flex; align-items: center; text-decoration: none; margin-bottom: 1rem; } .footer-logo-img-standard { height: 38px; }
.footer-logo-text-standard { font-family: var(--font-logo); font-size: 1.6rem; color: var(--primary-brand-color); font-weight: 700; }
.footer-tagline-standard { line-height: 1.7; opacity: 0.8; margin-bottom: 1.5rem; }
.footer-social-icons-standard a { color: var(--navbar-text-color); font-size: 1.3rem; margin-right: 1rem; transition: all var(--transition-speed) ease; } .footer-social-icons-standard a:hover { color: var(--primary-brand-color); transform: translateY(-2px); }
.footer-column-standard h4 { color: var(--navbar-text-hover); margin-bottom: 1.2rem; }
.footer-links-group-standard ul { list-style: none; padding: 0; } .footer-links-group-standard li a { color: var(--navbar-text-color); text-decoration: none; padding: 0.4rem 0; display: block; transition: all var(--transition-speed) ease; } .footer-links-group-standard li a:hover { color: var(--primary-brand-color); padding-left: 8px; }
.footer-bottom-standard { text-align: center; padding-top: 2.5rem; border-top: 1px solid var(--dropdown-border); opacity: 0.7; }
.footer-heart-icon { color: var(--secondary-accent-color); animation: pulseHeart 1.5s infinite ease-in-out; }

/* ========================================= */
/* 2. PERIODIC TABLE TOOL SPECIFIC STYLES  */
/* ========================================= */

.tool-container-periodic {
     width: 100%;
     padding: 120px 1rem 4rem 1rem;
}
.tool-hero-section { text-align: center; margin-bottom: 2rem; animation: fadeIn 1s ease-out; }
.tool-hero-section h1 { font-family: var(--font-logo); font-size: 2.8rem; margin-bottom: 1rem; background: linear-gradient(90deg, var(--primary-brand-color), var(--secondary-accent-color)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.tool-hero-section p { font-size: 1.1rem; color: var(--text-muted); max-width: 600px; margin: 0 auto; }

#periodic-table-container {
    display: grid;
    grid-template-columns: repeat(18, minmax(0, 1fr));
    gap: 5px;
    max-width: 1400px;
    margin: 1rem auto;
    padding: 1rem;
    animation: fadeIn 1s ease-out .2s;
}

.element-cell {
    position: relative;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-main);
    color: #fff;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    aspect-ratio: 1 / 1.2;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 4px;
}

@media (max-width: 1200px) {
    .element-cell .name { font-size: 0.5em; }
    .element-cell .symbol { font-size: 1.2em; }
}
@media (max-width: 768px) {
    #periodic-table-container { gap: 3px; }
    .element-cell .name { display: none; }
    .element-cell .symbol { font-size: 1em; }
    .element-cell .atomic-number { font-size: 0.6em; }
}
@media (max-width: 480px) {
    #periodic-table-container { gap: 2px; }
    .element-cell .symbol { font-size: 0.8em; }
}

.element-cell:hover {
    transform: scale(1.15);
    border-color: var(--primary-brand-color);
    box-shadow: 0 0 15px var(--primary-brand-color);
    z-index: 10;
}

.element-cell .atomic-number {
    position: absolute;
    top: 4px;
    left: 4px;
    font-size: 0.7em;
    font-weight: 500;
    color: var(--text-muted);
}
.element-cell .symbol {
    font-size: 1.5em;
    font-weight: 700;
    line-height: 1;
    margin: 0;
}
.element-cell .name {
    font-size: 0.65em;
    word-wrap: break-word;
    line-height: 1.1;
    margin-top: 3px;
}

/* Element Category Colors */
.element-cell.actinide { background-color: #A072D2; border-color: #A072D2; }
.element-cell.alkali-metal { background-color: #E26E52; border-color: #E26E52; }
.element-cell.alkaline-earth-metal { background-color: #E5A354; border-color: #E5A354; }
.element-cell.lanthanide { background-color: #D291BC; border-color: #D291BC; }
.element-cell.metalloid { background-color: #49BFA8; border-color: #49BFA8; }
.element-cell.noble-gas { background-color: #55B5E6; border-color: #55B5E6; }
.element-cell.diatomic-nonmetal, .element-cell.polyatomic-nonmetal { background-color: #63DA6A; border-color: #63DA6A; }
.element-cell.post-transition-metal { background-color: #63AEE9; border-color: #63AEE9; }
.element-cell.transition-metal { background-color: #E27B8A; border-color: #E27B8A; }
.element-cell.unknown { background-color: #A9A9A9; border-color: #A9A9A9; }

/* Lanthanide/Actinide placeholder */
.series-placeholder {
    background: rgba(var(--primary-brand-color), 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8em;
    text-align: center;
    padding: 5px;
    border-radius: var(--border-radius-main);
}

/* Modal Styles */
#element-details-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(5, 6, 8, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1200;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s;
}

#element-details-modal.visible {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--dropdown-background);
    padding: 2.5rem;
    border-radius: 20px;
    width: 90%;
    max-width: 650px;
    position: relative;
    border: 1px solid var(--primary-brand-color);
    box-shadow: 0 0 30px var(--dropdown-shadow);
    transform: scale(0.9);
    transition: transform 0.4s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

#element-details-modal.visible .modal-content {
    transform: scale(1);
}

.modal-close-btn {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    font-size: 2.2rem;
    color: var(--text-color);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
}
.modal-close-btn:hover {
     color: var(--secondary-accent-color);
     transform: rotate(90deg);
}

.modal-body h2 {
    color: var(--primary-brand-color);
    font-family: var(--font-logo);
    font-size: 2rem;
    text-align: center;
    margin-bottom: 1.5rem;
}
.modal-body .element-summary {
    font-size: 1rem;
    margin-bottom: 1.5rem;
    text-align: center;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}
.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.details-grid p {
    background: var(--input-bg-color);
    padding: 0.8rem 1rem;
    border-radius: var(--border-radius-main);
    margin: 0;
}
.details-grid strong {
    color: var(--primary-brand-color);
    margin-right: 8px;
}