:root {
    --navy: #0A192F;
    --navy-light: #112240;
    --silver: #C0C0C0;
    --white: #F8F9FA;
    --text: #8892B0;
    --blue: #64FFDA;
    --font-serif: 'Playfair Display', serif;
    --font-sans: 'Inter', sans-serif;
}

* { margin:0; padding:0; box-sizing:border-box; }
body { font-family: var(--font-sans); background-color: var(--navy); color: var(--text); line-height: 1.6; }
a { text-decoration: none; color: var(--blue); }
.tv-container { max-width: 1200px; margin: 0 auto; padding: 0 40px; }
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-4 { margin-bottom: 4rem; }
.max-800 { max-width: 800px; margin: 0 auto; }
.serif-head { font-family: var(--font-serif); color: var(--white); font-weight: 600; }
.text-blue { color: var(--blue); }

/* Top & Nav */
.top-bar-secure { background: #020C1B; font-size: 0.8rem; padding: 10px 0; border-bottom: 1px solid var(--navy-light); }
.top-bar-secure .tv-container { display: flex; justify-content: space-between; color: var(--silver); }
.phone-bar a { color: var(--silver); }
.tv-header { padding: 30px 0; border-bottom: 1px solid var(--navy-light); }
.header-layout { display: flex; justify-content: space-between; align-items: center; }
.tv-logo { display: flex; align-items: center; gap: 12px; font-family: var(--font-serif); font-size: 1.8rem; font-weight: 700; color: var(--white); letter-spacing: 1px; }
.shield-logo svg { width: 24px; height: 24px; color: var(--blue); }
.tv-nav { display: flex; align-items: center; gap: 30px; }
.tv-nav a:not(.btn-outline-silver) { color: var(--white); font-size: 0.95rem; font-weight: 500; letter-spacing: 0.5px; transition: color 0.2s; }
.tv-nav a:not(.btn-outline-silver):hover { color: var(--blue); }

/* Buttons */
.btn-outline-silver { border: 1px solid var(--blue); color: var(--blue); padding: 10px 20px; border-radius: 4px; font-weight: 500; font-size: 0.9rem; transition: background 0.2s; display: inline-block; }
.btn-outline-silver:hover { background: rgba(100, 255, 218, 0.1); }
.btn-solid-blue { background: var(--blue); color: var(--navy); border: none; padding: 12px 25px; border-radius: 4px; font-weight: 600; font-size: 1rem; cursor: pointer; display: inline-block; transition: background 0.2s; }
.btn-solid-blue:hover { background: var(--white); }

/* Hero */
.hero-tv { padding: 100px 0; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.hero-left h1 { font-size: 3.5rem; line-height: 1.1; margin-bottom: 25px; }
.tv-lead { font-size: 1.1rem; margin-bottom: 30px; max-width: 480px; }
.device-lock { position: relative; border: 1px solid var(--blue); padding: 10px; border-radius: 8px; background: var(--navy-light); }
.device-lock img { width: 100%; border-radius: 4px; display: block; opacity: 0.8; }
.lock-overlay { position: absolute; bottom: 20px; right: 20px; background: rgba(2, 12, 27, 0.9); border: 1px solid var(--blue); padding: 10px 15px; border-radius: 4px; }
.auth-text { color: var(--blue); font-family: monospace; font-size: 0.85rem; letter-spacing: 1px; }

/* Features */
.features-tv { padding: 80px 0; background: #020C1B; border-top: 1px solid var(--navy-light); }
.line-under { position: relative; padding-bottom: 20px; margin-bottom: 40px; font-size: 2.5rem; }
.line-under::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 60px; height: 1px; background: var(--blue); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1px solid var(--navy-light); border-radius: 8px; background: var(--navy); }
.vault-feature { padding: 50px 40px; border-right: 1px solid var(--navy-light); }
.border-right-0 { border-right: none; }
.vault-feature h4 { font-family: var(--font-serif); font-size: 1.3rem; color: var(--white); margin-bottom: 15px; }

/* Sub Layouts */
.page-title-tv { padding: 60px 0 40px; border-bottom: 1px solid var(--navy-light); text-align: center; }
.page-title-tv h1 { font-size: 3rem; margin-bottom: 15px; }
.tv-article p { margin-bottom: 20px; font-size: 1.1rem; }
.diagram-box { border: 1px solid var(--navy-light); padding: 20px; background: #020C1B; }
.diagram-box img { width: 100%; filter: grayscale(100%) contrast(1.2); opacity: 0.8; }
.auth-box { border: 1px solid var(--navy-light); padding: 50px; background: #020C1B; border-radius: 8px; }

/* Footer & Form */
.tv-footer { background: #020C1B; border-top: 1px solid var(--navy-light); padding-top: 80px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 80px; padding-bottom: 60px; border-bottom: 1px solid rgba(255,255,255,0.05); }
.footer-form-col p { margin-bottom: 25px; margin-top: 10px; }
.tv-form { background: var(--navy); padding: 30px; border: 1px solid var(--navy-light); border-radius: 8px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.tv-form input, .tv-form select { width: 100%; background: #020C1B; border: 1px solid var(--navy-light); color: var(--silver); padding: 12px 15px; font-family: var(--font-sans); border-radius: 4px; outline: none; }
.tv-form input:focus, .tv-form select:focus { border-color: var(--blue); }
.encryption-note { font-size: 0.75rem; color: #555; text-align: center; margin-top: 15px; font-family: monospace; }
.footer-contact-col address { font-style: normal; line-height: 1.8; margin-top: 15px; }
.legal-links a { color: var(--text); font-size: 0.9rem; }
.legal-links a:hover { color: var(--blue); }
.footer-bottom { padding: 30px 40px; text-align: center; font-size: 0.85rem; font-family: monospace; color: #555; }

/* Modal */
.tv-modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(2,12,27,0.8); backdrop-filter: blur(5px); z-index: 9999; align-items: center; justify-content: center; }
.tv-modal-content { background: var(--navy); border: 1px solid var(--blue); padding: 40px; max-width: 500px; border-radius: 8px; text-align: center; box-shadow: 0 0 30px rgba(100, 255, 218, 0.1); }
.tv-modal-content h3 { margin-bottom: 20px; }
.tv-modal-content p { margin-bottom: 30px; font-size: 0.9rem; }

@media (max-width: 900px) {
    .hero-grid, .footer-grid, .grid-3 { grid-template-columns: 1fr; gap: 40px; }
    .tv-nav { display: none; }
    .vault-feature { border-right: none; border-bottom: 1px solid var(--navy-light); }
    .top-bar-secure .security-badge { display: none; }
    .form-row { grid-template-columns: 1fr; }
}