/* =====================================================
   CALCULATOR.CSS - InfraPilot Calculator Page (COMPLETE)
   Integrated version with all improvements and animations
   ===================================================== */

:root {
    --primary-blue: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --dark-bg: #0f172a;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --success-green: #10b981;
    --warning-amber: #f59e0b;
    --error-red: #ef4444;
}

/* =====================================================
   HERO SECTION
   ===================================================== */

.calc-hero {
    position: relative;
    background: linear-gradient(180deg, var(--gray-50) 0%, white 100%);
    padding: clamp(60px, 10vw, 100px) 0 clamp(40px, 8vw, 80px);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
            linear-gradient(rgba(148, 163, 184, 0.05) 1px, transparent 1px),
            linear-gradient(90deg, rgba(148, 163, 184, 0.05) 1px, transparent 1px);
    background-size: 40px 40px;
}

.hero-gradient {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(37, 99, 235, 0.06) 0%, transparent 60%);
}

.calc-header {
    position: relative;
    text-align: center;
    max-width: 700px;
    margin: 0 auto 40px;
}

.header-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: white;
    border: 1px solid var(--gray-200);
    padding: 8px 16px;
    border-radius: 100px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.header-badge i {
    color: var(--primary-blue);
    font-size: 14px;
}

.header-badge span {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
}

.calc-title {
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 700;
    color: var(--gray-900);
    line-height: 1.15;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.calc-title .highlight {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% auto;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.calc-subtitle {
    font-size: 1.1rem;
    color: var(--gray-500);
    line-height: 1.6;
    margin: 0;
}

/* =====================================================
   MODE TOGGLE
   ===================================================== */

.mode-toggle-wrapper {
    display: flex;
    justify-content: center;
}

.mode-toggle {
    display: inline-flex;
    background: white;
    border-radius: 16px;
    padding: 6px;
    border: 1px solid var(--gray-200);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    gap: 6px;
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 24px;
    background: transparent;
    border: 2px solid transparent;
    border-radius: 12px;
    cursor: pointer;
    transition: background-color 0.3s ease,
    border-color 0.3s ease,
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.mode-btn:hover {
    background: var(--gray-50);
}

.mode-btn.active {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
}

.mode-btn i {
    font-size: 20px;
    color: var(--gray-400);
}

.mode-btn.active i {
    color: white;
}

.mode-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
}

.mode-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
}

.mode-btn.active .mode-name {
    color: white;
}

.mode-desc {
    font-size: 12px;
    color: var(--gray-400);
}

.mode-btn.active .mode-desc {
    color: rgba(255, 255, 255, 0.7);
}

.mode-tag {
    font-size: 9px;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: 6px;
    background: var(--gray-100);
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.mode-tag.recommended {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-green);
}

.mode-btn.active .mode-tag {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* =====================================================
   RESPONSIVE - CALCULATOR PAGE
   ===================================================== */

@media (max-width: 992px) {
    .calc-hero {
        padding: 48px 0 40px;
    }

    .calc-header {
        margin-bottom: 32px;
    }

    .mode-toggle {
        flex-direction: column;
        width: 100%;
        max-width: 400px;
    }

    .mode-btn {
        width: 100%;
        justify-content: flex-start;
    }
}

@media (max-width: 768px) {
    .calc-hero {
        padding: 32px 0 28px;
    }

    .container {
        padding-left: 12px;
        padding-right: 12px;
    }

    .calc-header {
        margin-bottom: 24px;
    }

    .header-badge {
        padding: 6px 12px;
        margin-bottom: 16px;
    }

    .header-badge i {
        font-size: 12px;
    }

    .header-badge span {
        font-size: 12px;
    }

    .calc-title {
        font-size: 1.6rem;
        margin-bottom: 12px;
    }

    .calc-subtitle {
        font-size: 0.95rem;
        padding: 0 8px;
    }

    /* Mode Toggle - Mobile */
    .mode-toggle-wrapper {
        padding: 0 4px;
    }

    .mode-toggle {
        width: 100%;
        max-width: none;
        padding: 4px;
        border-radius: 12px;
        gap: 4px;
    }

    .mode-btn {
        padding: 12px 14px;
        gap: 10px;
        border-radius: 10px;
    }

    .mode-btn i {
        font-size: 18px;
    }

    .mode-info {
        flex: 1;
    }

    .mode-name {
        font-size: 13px;
    }

    .mode-desc {
        font-size: 11px;
    }

    .mode-tag {
        font-size: 8px;
        padding: 3px 6px;
    }

    /* Loading overlay - mobile */
    .loading-overlay {
        padding: 20px;
    }

    .loading-spinner p {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .calc-hero {
        padding: 24px 0 20px;
    }

    .header-badge {
        padding: 5px 10px;
    }

    .header-badge span {
        font-size: 11px;
    }

    .calc-title {
        font-size: 1.4rem;
    }

    .calc-subtitle {
        font-size: 0.9rem;
        line-height: 1.5;
    }

    .mode-toggle {
        padding: 3px;
    }

    .mode-btn {
        padding: 10px 12px;
        gap: 8px;
    }

    .mode-btn i {
        font-size: 16px;
    }

    .mode-name {
        font-size: 12px;
    }

    .mode-desc {
        font-size: 10px;
    }

    .mode-tag {
        font-size: 7px;
        padding: 2px 5px;
    }
}