/* ===================== ГЛОБАЛЬНЫЕ ПЕРЕМЕННЫЕ ===================== */
:root {
    --silver-light: #f5f5f5;
    --silver-mid: #e0e0e0;
    --silver-dark: #b0b0b0;
    --silver-darker: #8a8a8a;
    --text-dark: #1b1b1b;
    --text-mid: #4b4b4b;
    --success-color: #28a745;
    --error-color: #dc3545;
    --warning-color: #ffc107;
    --shadow-sm: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-md: 0 10px 30px rgba(0,0,0,0.2);
    --shadow-lg: 0 25px 60px rgba(0,0,0,0.35);
    --transition-fast: 0.3s ease;
    --transition-mid: 0.5s ease;
}

/* ===================== ОБЩИЕ СТИЛИ ===================== */
body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(145deg, var(--silver-mid), var(--silver-light));
    color: var(--text-dark);
    overflow-x: hidden;
}

/* ===================== ГЛАВНАЯ СЕКЦИЯ КОНТАКТОВ ===================== */
.py-5 {
    position: relative;
    overflow: hidden;
}

.py-5::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: rotateBackground 25s linear infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes rotateBackground {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Заголовки секции */
.py-5 .text-success {
    color: var(--silver-darker) !important;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    animation: fadeInDown 0.8s ease;
    position: relative;
    z-index: 1;
}

.py-5 h2 {
    color: var(--text-dark);
    font-weight: 800;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.1);
    animation: fadeInUp 1s ease;
    position: relative;
    z-index: 1;
}

/* ===================== ФОРМА КОНТАКТОВ ===================== */
.py-5 form {
    background: linear-gradient(145deg, rgba(255,255,255,0.95), var(--silver-light));
    border: 1px solid rgba(255,255,255,0.5);
    border-radius: 24px;
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-lg), inset 0 2px 4px rgba(255,255,255,0.3);
    position: relative;
    overflow: hidden;
    animation: scaleIn 1s ease;
    backdrop-filter: blur(10px);
    z-index: 1;
}

.py-5 form::before {
    content: "";
    position: absolute;
    top: -100%;
    left: -100%;
    width: 300%;
    height: 300%;
    background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, transparent 60%);
    transition: all 0.6s ease;
    pointer-events: none;
}

.py-5 form:hover::before {
    top: -50%;
    left: -50%;
}

/* Лейблы */
.py-5 form label {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    display: block;
    transition: color var(--transition-fast);
}

.py-5 form label.required::after {
    content: " *";
    color: var(--error-color);
    font-weight: bold;
}

.py-5 form label.optional::after {
    content: " *";
    color: var(--warning-color);
    font-weight: bold;
}

/* Поля ввода */
.py-5 .form-control {
    background: linear-gradient(145deg, #ffffff, var(--silver-light));
    border: 2px solid rgba(176, 176, 176, 0.3);
    border-radius: 12px;
    padding: 0.85rem 1.2rem;
    font-size: 1rem;
    color: var(--text-dark);
    transition: all var(--transition-fast);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}

.py-5 .form-control:focus {
    outline: none;
    border-color: var(--silver-darker);
    box-shadow: 0 0 0 4px rgba(138, 138, 138, 0.15), 
                inset 0 2px 4px rgba(0,0,0,0.08);
    background: #ffffff;
    transform: translateY(-2px);
}

.py-5 .form-control::placeholder {
    color: var(--text-mid);
    opacity: 0.6;
}

/* Textarea */
.py-5 #message-1 {
    resize: none;
    min-height: 150px;
    font-family: 'Inter', sans-serif;
}

/* Счетчик символов */
#char-count {
    font-size: 0.85rem;
    color: var(--text-mid);
    margin-top: 0.5rem;
    text-align: right;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.py-5 #message-1:focus ~ #char-count {
    color: var(--silver-darker);
    font-weight: 600;
}

/* Сообщения об ошибках */
.error-message {
    color: var(--error-color);
    font-size: 0.85rem;
    margin-top: 0.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    animation: shakeError 0.4s ease;
}

.error-message::before {
    content: "⚠";
    font-size: 1rem;
}

@keyframes shakeError {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Сообщения об успехе */
.success-message,
#response-message {
    font-weight: 700;
    font-size: 1rem;
    padding: 1rem;
    border-radius: 12px;
    margin-top: 1rem;
    animation: fadeInUp 0.6s ease;
    text-align: center;
}

#response-message[style*="color: green"],
.success-message {
    color: var(--success-color) !important;
    background: linear-gradient(145deg, rgba(40, 167, 69, 0.1), rgba(40, 167, 69, 0.05));
    border: 2px solid rgba(40, 167, 69, 0.3);
}

#response-message[style*="color: red"] {
    color: var(--error-color) !important;
    background: linear-gradient(145deg, rgba(220, 53, 69, 0.1), rgba(220, 53, 69, 0.05));
    border: 2px solid rgba(220, 53, 69, 0.3);
}

/* Кнопка отправки */
.py-5 .btn-primary {
    background: linear-gradient(90deg, var(--silver-mid), var(--silver-dark));
    border: 2px solid rgba(255,255,255,0.4);
    border-radius: 14px;
    padding: 0.95rem 2rem;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-dark);
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.py-5 .btn-primary::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(255,255,255,0.4) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: width 0.5s ease, height 0.5s ease;
    border-radius: 50%;
}

.py-5 .btn-primary:hover::before {
    width: 300px;
    height: 300px;
}

.py-5 .btn-primary:hover {
    background: linear-gradient(90deg, var(--silver-light), var(--silver-mid));
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 12px 30px rgba(0,0,0,0.3);
    border-color: rgba(255,255,255,0.6);
}

.py-5 .btn-primary:active {
    transform: translateY(-1px) scale(0.98);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

/* ===================== КОНТАКТНАЯ ИНФОРМАЦИЯ ===================== */
.py-5 .d-flex.flex-md-column {
    gap: 1rem;
}

.py-5 .d-flex.align-items-center.p-3 {
    width: 100%;
    background: linear-gradient(145deg, rgba(255,255,255,0.9), var(--silver-light));
    border: 1px solid rgba(255,255,255,0.4);
    border-radius: 16px;
    padding: 1.2rem 1.5rem !important;
    box-shadow: var(--shadow-sm), inset 0 1px 2px rgba(255,255,255,0.3);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    justify-content: center;
}

.py-5 .d-flex.align-items-center.p-3::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--silver-dark), var(--silver-darker));
    transform: scaleY(0);
    transition: transform var(--transition-fast);
}

.py-5 .d-flex.align-items-center.p-3:hover {
    transform: translateX(8px) scale(1.02);
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
    background: linear-gradient(145deg, #ffffff, var(--silver-mid));
}

.py-5 .d-flex.align-items-center.p-3:hover::before {
    transform: scaleY(1);
}

/* Иконки контактов */
.py-5 .bs-icon-md {
    width: 60px;
    height: 60px;
    background: linear-gradient(145deg, var(--silver-light), var(--silver-mid));
    color: var(--text-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    font-size: 1.6rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.15), inset 0 2px 4px rgba(255,255,255,0.3);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.py-5 .d-flex.align-items-center.p-3:hover .bs-icon-md {
    transform: scale(1.15) rotate(10deg);
    box-shadow: 0 8px 20px rgba(0,0,0,0.25);
    background: linear-gradient(145deg, #ffffff, var(--silver-light));
}

.px-2{
    min-width: 150px;
}

/* Текст контактов */
.py-5 .px-2 h6 {
    color: var(--text-dark);
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: 0.3rem;
}

.py-5 .px-2 p {
    color: var(--text-mid);
    font-size: 0.95rem;
    margin: 0;
    font-weight: 500;
}

/* Анимация появления контактных блоков */
.py-5 .d-flex.align-items-center.p-3:nth-child(1) {
    animation: fadeInLeft 0.8s ease 0.2s backwards;
}

.py-5 .d-flex.align-items-center.p-3:nth-child(2) {
    animation: fadeInLeft 0.8s ease 0.4s backwards;
}

.py-5 .d-flex.align-items-center.p-3:nth-child(3) {
    animation: fadeInLeft 0.8s ease 0.6s backwards;
}

/* ===================== FOOTER ===================== */
footer.bg-dark {
    background: linear-gradient(135deg, var(--silver-dark) 0%, var(--text-dark) 100%) !important;
    color: var(--silver-light);
    margin-top: 5rem;
}

footer h3 {
    color: var(--silver-light);
    font-weight: 700;
}

footer a {
    color: var(--silver-mid);
    transition: all var(--transition-fast);
    position: relative;
    padding-left: 0;
}

footer a::before {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    background: var(--silver-light);
    transition: width var(--transition-fast);
}

footer a:hover {
    color: var(--silver-light);
    padding-left: 8px;
}

footer a:hover::before {
    width: 100%;
}

/* ===================== KEYFRAME ANIMATIONS ===================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ===================== RESPONSIVE DESIGN ===================== */
@media (max-width: 1200px) {
    .py-5 h2 {
        font-size: 2.2rem;
    }
}

@media (max-width: 992px) {
    .py-5 h2 {
        font-size: 2rem;
    }
    
    .py-5 form {
        padding: 2rem 1.5rem;
    }
}

@media (max-width: 768px) {
    .py-5 {
        padding: 3rem 0 !important;
    }
    
    .py-5 h2 {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }
    
    .py-5 form {
        padding: 1.5rem 1.2rem;
        border-radius: 18px;
    }
    
    .py-5 .form-control {
        padding: 0.75rem 1rem;
        font-size: 0.95rem;
    }
    
    .py-5 .btn-primary {
        padding: 0.85rem 1.5rem;
        font-size: 1rem;
    }
    
    .py-5 .bs-icon-md {
        width: 52px;
        height: 52px;
        font-size: 1.4rem;
    }
    
    .py-5 .d-flex.align-items-center.p-3 {
        padding: 1rem 1.2rem !important;
        margin-bottom: 0.8rem;
    }
    
    .py-5 .px-2 h6 {
        font-size: 1rem;
    }
    
    .py-5 .px-2 p {
        font-size: 0.9rem;
    }
    
    /* Все контактные блоки появляются одинаково на мобильных */
    .py-5 .d-flex.align-items-center.p-3:nth-child(1),
    .py-5 .d-flex.align-items-center.p-3:nth-child(2),
    .py-5 .d-flex.align-items-center.p-3:nth-child(3) {
        animation: fadeInUp 0.8s ease backwards;
    }
}

@media (max-width: 576px) {
    .py-5 h2 {
        font-size: 1.5rem;
    }
    
    .py-5 form {
        padding: 1.2rem 1rem;
        border-radius: 16px;
    }
    
    .py-5 .form-control {
        padding: 0.7rem 0.9rem;
        font-size: 0.9rem;
        border-radius: 10px;
    }
    
    .py-5 #message-1 {
        min-height: 120px;
    }
    
    .py-5 .btn-primary {
        padding: 0.8rem 1.2rem;
        font-size: 0.95rem;
        border-radius: 12px;
    }
    
    #char-count {
        font-size: 0.8rem;
    }
    
    .py-5 .bs-icon-md {
        width: 48px;
        height: 48px;
        font-size: 1.3rem;
    }
    
    .py-5 .d-flex.align-items-center.p-3 {
        padding: 0.9rem 1rem !important;
        border-radius: 14px;
    }
    
    .py-5 .px-2 h6 {
        font-size: 0.95rem;
    }
    
    .py-5 .px-2 p {
        font-size: 0.85rem;
    }
}

/* ===================== PERFORMANCE OPTIMIZATIONS ===================== */
* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.form-control,
.btn-primary,
.bs-icon-md,
.d-flex.align-items-center.p-3 {
    will-change: transform;
}

/* Accessibility: уважение настроек пользователя */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===================== ДОПОЛНИТЕЛЬНЫЕ УЛУЧШЕНИЯ ===================== */

/* Фокус-индикатор для доступности */
.py-5 .form-control:focus-visible {
    outline: 3px solid var(--silver-darker);
    outline-offset: 2px;
}

/* Стиль для заполненных полей */
.py-5 .form-control:valid:not(:placeholder-shown) {
    border-color: var(--success-color);
    background: linear-gradient(145deg, rgba(40, 167, 69, 0.05), #ffffff);
}

/* Стиль для невалидных полей при попытке отправки */
.py-5 .form-control:invalid:not(:placeholder-shown) {
    border-color: var(--error-color);
    background: linear-gradient(145deg, rgba(220, 53, 69, 0.05), #ffffff);
}

/* Hover эффект для полей */
.py-5 .form-control:hover:not(:focus) {
    border-color: var(--silver-darker);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* Loading state для кнопки */
.py-5 .btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Плавный скролл для всей страницы */
html {
    scroll-behavior: smooth;
}