:root {
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-sub: #64748b;
    --border: #f1f5f9;
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    
    /* Gradients */
    --gradient-blue: linear-gradient(135deg, #3b82f6, #4f46e5);
    --gradient-green: linear-gradient(135deg, #10b981, #059669);
    --gradient-orange: linear-gradient(135deg, #f59e0b, #ea580c);
    --gradient-purple: linear-gradient(135deg, #8b5cf6, #6d28d9);
    --gradient-red: linear-gradient(135deg, #ef4444, #b91c1c);
    --gradient-cyan: linear-gradient(135deg, #06b6d4, #0891b2);
}

html.dark {
    --bg-body: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f8fafc;
    --text-sub: #94a3b8;
    --border: #334155;
}

body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background: var(--bg-body);
    color: var(--text-main);
    transition: background 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 40px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: background 0.3s ease, border-color 0.3s ease;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-blue);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
}

.logo-text h1 {
    font-size: 18px;
    font-weight: 900;
    margin: 0;
    letter-spacing: 2px;
    color: var(--text-main);
}

.limit-badge {
    background: var(--bg-card);
    color: var(--text-main);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 10px;
    font-weight: 700;
    border: 1px solid var(--border);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 4px;
}

/* Nav Controls */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.custom-header-btn {
    padding: 8px 16px;
    border-radius: 10px;
    font-weight: 800;
    font-size: 11px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Inter', sans-serif;
    text-decoration: none;
}

.custom-header-btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 12px rgba(0,0,0,0.1);
}

.custom-header-btn:active {
    transform: scale(0.95);
}

.btn-gray { background: var(--bg-body); color: var(--text-main); border: 1px solid var(--border); }
.btn-blue { background: var(--gradient-blue); color: white; }
.btn-green { background: var(--gradient-green); color: white; }
.btn-orange { background: var(--gradient-orange); color: white; }
.btn-purple { background: var(--gradient-purple); color: white; }
.btn-red { background: #fef2f2; color: #ef4444; border: 1px solid #fecaca; }
.btn-icon { width: 38px; height: 38px; padding: 0; border-radius: 50%; background: var(--bg-body); border: 1px solid var(--border); color: var(--text-main); }

html.dark .btn-gray, html.dark .btn-icon { background: #1e293b; border-color: #334155; color: #cbd5e1; }
html.dark .btn-red { background: rgba(239, 68, 68, 0.1); color: #f87171; border-color: rgba(239, 68, 68, 0.2); }

/* Hero Section */
.hero {
    padding: 60px 20px 40px;
    text-align: center;
}

.hero-content h2 {
    font-size: 42px;
    font-weight: 900;
    margin: 0;
    color: var(--text-main);
    letter-spacing: -1px;
}

.hero-content h2 span {
    color: var(--primary);
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content p {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-sub);
    max-width: 600px;
    margin: 15px auto 0;
    line-height: 1.6;
}

/* Dashboard Container */
.dashboard-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px 60px;
}

.section-title h3 {
    font-size: 20px;
    font-weight: 800;
    color: var(--text-main);
    margin: 0 0 20px 0;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

/* Tool Cards */
.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 20px;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05);
}

.tool-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1);
    border-color: var(--primary);
}

.tool-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    flex-shrink: 0;
    box-shadow: inset 0 2px 4px rgba(255,255,255,0.3);
}

.tool-icon.blue { background: var(--gradient-blue); }
.tool-icon.orange { background: var(--gradient-orange); }
.tool-icon.green { background: var(--gradient-green); }
.tool-icon.purple { background: var(--gradient-purple); }
.tool-icon.red { background: var(--gradient-red); }
.tool-icon.cyan { background: var(--gradient-cyan); }

.tool-info h4 {
    margin: 0;
    font-size: 16px;
    font-weight: 800;
    color: var(--text-main);
}

.tool-info p {
    margin: 6px 0 0;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-sub);
    line-height: 1.5;
}

/* Auth Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(8px);
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--bg-card);
    width: 100%;
    max-width: 450px;
    border-radius: 24px;
    padding: 30px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
    transform: scale(0.95) translateY(20px);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: 1px solid var(--border);
    max-height: 90vh;
    overflow-y: auto;
}

.modal-overlay.active .modal-content {
    transform: scale(1) translateY(0);
}

.modal-content::-webkit-scrollbar {
    width: 6px;
}
.modal-content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 10px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.modal-header h3 {
    margin: 0;
    font-size: 20px;
    font-weight: 900;
    color: var(--text-main);
}

.modal-close {
    background: var(--bg-body);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    color: var(--text-sub);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background 0.2s, color 0.2s;
}

.modal-close:hover {
    background: var(--danger);
    color: white;
}

.input-group {
    margin-bottom: 16px;
}

.input-group label {
    display: block;
    font-size: 11px;
    font-weight: 800;
    color: var(--text-sub);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    border-radius: 12px;
    border: 2px solid var(--border);
    background: var(--bg-body);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 600;
    box-sizing: border-box;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

.input-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

.auth-btn {
    width: 100%;
    padding: 14px;
    background: var(--gradient-blue);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 800;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.2s ease;
    margin-top: 10px;
}

.auth-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 15px rgba(79, 70, 229, 0.3);
}

.auth-btn:active {
    transform: scale(0.98);
}

.auth-link {
    display: block;
    text-align: center;
    margin-top: 15px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    cursor: pointer;
    text-decoration: none;
}

.auth-link:hover {
    text-decoration: underline;
}

/* Toast Notifications */
.toast {
    background: var(--bg-card);
    color: var(--text-main);
    padding: 12px 20px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    font-weight: 600;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideUpIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    border-left: 4px solid var(--primary);
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: #f59e0b; }

@keyframes slideUpIn {
    from { opacity: 0; transform: translateY(20px) scale(0.9); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes fadeOut {
    to { opacity: 0; transform: translateY(-10px); }
}

/* OTP Inputs */
.otp-inputs {
    display: flex;
    gap: 8px;
    justify-content: center;
    margin-bottom: 20px;
}

.otp-inputs input {
    width: 45px;
    height: 50px;
    text-align: center;
    font-size: 20px;
    font-weight: 900;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: var(--bg-body);
    color: var(--text-main);
    outline: none;
    transition: all 0.2s;
}

.otp-inputs input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

body {
    animation: fadeIn 0.5s ease-out;
}