:root{--primary: #1F2A44;--secondary: #4A8A74;--accent: #3C6B5E;--light: #FAF7F2;--dark: #212529;--gray: #6c757d;--light-gray: #e9ecef;--success: #28a745;--warning: #ffc107;--danger: #dc3545;--eggshell: #F5F5F0;--eggshell-warm: #F8F6F0;--eggshell-cool: #F0F2F5;--space-xs: .25rem;--space-sm: .5rem;--space-md: 1rem;--space-lg: 1.5rem;--space-xl: 2rem;--space-xxl: 3rem;--border-radius-sm: 4px;--border-radius-md: 8px;--border-radius-lg: 12px;--text-xs: 1.25rem;--text-sm: 1.5rem;--text-base: 1.8rem;--text-lg: 2rem;--text-xl: 2.2rem;--text-2xl: 2.5rem;--text-3xl: 2.8rem;--text-4xl: 3.2rem;--text-5xl: 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h1{font-size:var(--text-4xl);color:var(--primary);margin-bottom:var(--space-md);line-height:1.2}.hero p{font-size:var(--text-lg);max-width:700px;margin:0 auto var(--space-xl);line-height:1.6}.btn,.search-button,.auth-submit,.google-signin,.install-btn{background-color:var(--secondary);color:var(--light);padding:var(--space-sm) var(--space-lg);border:none;border-radius:var(--border-radius-md);cursor:pointer;transition:all .3s ease;font-size:var(--text-base);font-weight:700;display:inline-block;margin:var(--space-sm);text-decoration:none;text-align:center}.btn:hover,.search-button:hover:not(:disabled),.auth-submit:hover:not(:disabled),.google-signin:hover:not(:disabled),.install-btn:hover{background-color:var(--accent);transform:translateY(-2px);box-shadow:0 4px 8px #0000001a}.btn:disabled,.search-button:disabled,.auth-submit:disabled,.google-signin:disabled{background:#ccc;cursor:not-allowed;transform:none;box-shadow:none}.btn-large{padding:var(--space-md) var(--space-xl);font-size:var(--text-lg)}.btn-outline{background:transparent;border:2px solid var(--secondary);color:var(--secondary)}.btn-outline:hover{background:var(--secondary);color:var(--light)}.search-button{padding:16px 28px;border-radius:12px}.login-btn{padding:var(--space-sm) var(--space-lg);background:linear-gradient(135deg,var(--secondary),var(--accent));color:#fff;border:none;border-radius:var(--border-radius-lg);cursor:pointer;font-weight:600;font-size:var(--text-base);transition:all .3s ease;box-shadow:0 6px 20px #4a8a7466;text-transform:uppercase;letter-spacing:1px;position:relative;overflow:hidden;display:inline-block;margin-right:auto}.login-btn:hover{background:linear-gradient(135deg,var(--accent),#2d5e4f);transform:translateY(-3px) scale(1.05)}.login-btn:active{transform:translateY(-1px) scale(1.02)}.login-prompt{background-color:#f8f9fa;border:1px solid #e9ecef;border-radius:8px;padding:20px;margin:20px 0;text-align:center}.login-prompt p{margin:0;font-size:var(--text-base);color:#495057}.login-prompt .login-btn{margin:0 5px}.general-login-prompt{text-align:center;margin:20px 0;padding:15px;background-color:#f8f9fa;border-radius:8px;border:1px solid #e9ecef}.general-login-prompt p{margin:0;font-size:var(--text-base)}.intro-login-prompt{text-align:left;margin-top:20px}.intro-login-btn{margin:10px 0;display:block;width:auto}.intro-login-text{font-size:var(--text-sm);color:#6c757d;margin-top:5px}.login-text-link{color:var(--secondary);text-decoration:underline;cursor:pointer;font-weight:600}.login-text-link:hover{color:var(--accent)}.auth-buttons{position:absolute;top:25px;right:25px;z-index:100}.app-introduction{background-color:#fffc;padding:20px;border-radius:8px;margin:20px 0;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.app-introduction h3{color:var(--primary);margin-bottom:10px;font-size:var(--text-2xl)}.app-introduction p{color:var(--dark);line-height:1.6;margin:0;font-size:var(--text-base)}@media 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