:root {
  --base-color: #eef2f7;         /* soft sky-blueish white */
  --base-variant: #d9e2ec;       /* light slate for cards/sections */
  --text-color: #1f2937;         /* dark grayish-blue for readability */
  --secondary-text: #4b5563;     /* muted gray for subtext */
  --primary-color: #0072ce;      /* IEEE blue, main highlights */
  --accent-color: #2d4592;       /* teal/aquamarine highlights */
  --button-color: #3b82f6;       /* soft vibrant blue for buttons */
  --button-text: #ffffff;         /* readable text on buttons */
  --hr-color: #0072ce;           /* primary line accent */
  --link-color: #0f52ba;         /* slightly darker blue links */
  --highlight-color: #6ee7b7; 
  
}
.dark-mode {
  --base-color: #0f172a;         /* deep navy/blue-black background */
  --base-variant: #1e293b;       /* slightly lighter dark panels */
  --text-color: #e2e8f0;         /* soft light gray text */
  --secondary-text: #94a3b8;     /* muted grayish-blue for subtext */
  --primary-color: #3b82f6;      /* vibrant blue highlights */
  --accent-color: #1476b8;       /* bold teal highlights */
  --button-color: #22d3ee;       /* turquoise buttons */
  --button-text: #0f172a;        /* dark text on buttons */
  --hr-color: #3b82f6;           /* accent lines */
  --link-color: #60a5fa; 
}
#contactSection {
  padding: 50px 20px;
  background-color: var(--base-variant);
  display: flex;
  justify-content: center;
  align-items: center;
}

.contactSection__container {
  max-width: 620px;
  width: 100%;
  background:(--base-variant); 
  border-radius: 20px;
  padding: 40px 35px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  box-sizing: border-box;
  font-family: 'Lato', sans-serif;
}

.contactSection__title {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  color: var(--primary-color);
  font-size: 2.4rem;
  text-align: center;
  margin-bottom: 30px;
  text-transform: uppercase;
}

.contactForm__group {
  margin-bottom: 20px;
  width: 100%;
}

.contactForm__label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-color);
}

.contactForm__input,
.contactForm__select,
.contactForm__textarea {
  width: 100%;
  padding: 14px 15px;
  font-size: 1rem;
  border: 2px solid var(--primary-color);
  border-radius: 10px;
  background-color:var(--base-color);
  transition: border-color 0.25s ease;
  box-sizing: border-box;
  outline: none;
  font-family: 'Lato', sans-serif;
  color: var(--text-color);
}

.contactForm__input:focus,
.contactForm__select:focus,
.contactForm__textarea:focus {
  border-color: var(--accent-color);
}

.contactForm__textarea {
  resize: vertical;
  min-height: 100px;
}

.contactForm__submitBtn {
  display: block;
  width: 100%;
  padding: 14px 0;
  background: linear-gradient(60deg, var(--accent-color), var(--primary-color));
  color: var(--button-text);
  border: none;
  border-radius: 14px;
  font-size: 1.15rem;
  cursor: pointer;
  font-weight: 700;
  letter-spacing: 1.2px;
  box-shadow: 0 6px 20px rgba(45, 69, 146, 0.25);
  transition: background 0.4s ease, box-shadow 0.4s ease;
}

.contactForm__submitBtn:hover {
  background: linear-gradient(60deg, var(--primary-color), var(--accent-color));
  box-shadow: 0 8px 28px rgba(21, 51, 114, 0.35);
}


@media (max-width: 600px) {
  .contactSection__logo {
    max-width: 120px !important;
    margin-bottom: 16px !important;
  }
  .contactSection__container {
    padding: 25px 15px !important;
    max-width: 95% !important;
  }
}


/* Responsive Design */

@media (max-width: 768px) {
  .contactSection__container {
    padding: 30px 20px;
    max-width: 90%;
  }

  .contactSection__title {
    font-size: 2rem;
    margin-bottom: 24px;
  }

  .contactForm__submitBtn {
    font-size: 1.05rem;
    padding: 12px 0;
  }
}

@media (max-width: 480px) {
  .contactSection__container {
    padding: 25px 15px;
    border-radius: 16px;
  }

  .contactSection__title {
    font-size: 1.65rem;
  }

  .contactForm__submitBtn {
    font-size: 1rem;
    padding: 10px 0;
  }
}
#toggle-button{
    position: fixed;
    top: 18px;
    right: 20px;
    height: 40px;
    width: 40px;
    border-radius: 50%;
    background: var(--accent-color);
    color: var(--button-text);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 9999;
}

.contactForm__input::placeholder,
.contactForm__select::placeholder,
.contactForm__textarea::placeholder {
  color: var(--secondary-text);
  opacity: 1;
}

.dark-mode .contactForm__input::placeholder,
.dark-mode .contactForm__select::placeholder,
.dark-mode .contactForm__textarea::placeholder {
  color: var(--secondary-text);
  opacity: 1;
}